The h Bar - 2017-08-30 (page 1 of 3)

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12:05 AM

@0ßelö7 any slowdown is enough. If it exists then it must be controllable and therefore can be molded (in principle, i.e. given arbitrarily good materials &c) into arbitrarily large slowdowns.

1 hour later…

1:23 AM

@EmilioPisanty have people made slowdowns to human timescales?

1 hour later…

2:29 AM

... wonderin' if anyone in this august assembly received the following email today:

WHAT IS THE ELECTRON ? / by Israel Socratus /

2:56 AM

The recently completed Wilshire Grand building in Los Angeles is now billed as the "tallest build west of the Mississipi river", and apparently can be expected to experience "4 g's" of peak acceleration at the top of the tower during a strong earthquake ( wired.com/2016/09/wilshire-grand-taking-risk-seismic-strategy ). Wouldn't this kill anyone who wasn't strapped to a wall with a safety harness? I'm imagining being flung around the room and bouncing off of walls and furniture

Maybe it would only hit peak acceleration for a split second and the average is much lower

3:55 AM

@Rumplestillskin It is redundant. But I guess it's one of those things that have come along for the ride for historical reasons

like 'second quantization'

Dirac delta 'function'. Whenever a physicist says that, a mathematician somewhere sheds a tear

Tears are also shed when the topic is no hair theorem

lol

1

Q: Nonlinear acoustic processes in air - how to quantitatively estimate power in four-wave mixing?

I'd like to understand if non-linear mixing of human speech with a high-power ultrasonic "carrier" in air could produce sidebands with more power than the original speech. 30 kHz to 300 kHz has a wavelength range from about 10 down to 1 millimeter in air. This is still much longer than the mean ...

acoustics non-linear-processes

Bounty expiring in about 45 minutes. Post something if you've got it; there's a grace period of 24 hours I believe.

Ooops, that's 35 minutes. (and +100). I believe the answer can still be edited and fleshed out over the next 24 hours.

4:14 AM

@Avantgarde what?

@Avantgarde meh

Many of us call it the delta function

@0ßelö7 Calling it 'no hair conjecture' versus 'no hair theorem'

@Giskard42 You can use a positive lens with slower speed of sound, like a bulge of colder air, or a negative lens with faster speed (hotter or more humid air). You might be able to use a thin membrane or a mesh to help try to contain it, but you have to be careful that those boundaries don't reflect more than you are trying togain.

So a simple reflector is definitely handier than a lens.

What frequency range are you looking to reflect? Stiff paper might be pretty good at higher frequencies, but if you want low frequencies - like bass or sub-woofer, you'll need something heavier.

@0ßelö7 morning. If you'd still like me to look over the poster I'd be interested in seeing it.

4:36 AM

@JohnRennie it's been sent to the printer

Too late

@0ßelö7 I'd still be interested in seeing it

user84215

The Physics Workshops room has been created.

user84215

in Physics Workshops, 1 min ago, by MathematicsAminPhysics

This room has been created to hold physics workshops. Please inform me of your suggestions to create events for them. Please note that your suggestions need not be very sophisticated; they can be elementary.

0

Q: Time paradox inside a black hole

At the event horizon of a black hole, time and the spatial direction toward the center exchange places. The direction inside the black hole from the event horizon to the the singularity in the center is the direction in time. Assume a symmetrical non-rotating black hole and also assume that thin...

black-holes spacetime metric-tensor observers event-horizon

That interchange of space and time coordinate

Wonder if rindler coordinates also suffer from that

5:11 AM

@Secret No. In the region beyond the Rindler horizon $t$ is still timelike and $x$ is still spacelike.

Ah nice

Hmm, I guess then the interchange of spacelike timelike in a black hole is perhaps an artifact of our coordinate system...?

@Secret I've just spend half an hour explaining that it's an artefact of the Schwarzschild coordinates.

Ah, so I guess the swapping occurs is because the t coordinate in the schwartzchild coordinate system blow up to infinity at the event horizon, thus inside the black hole, its behaviour will asymptote back in the "opposite direction"

result in the t and x coordintes to swap

@JohnRennie for some reason I can't see your email

that's what I thought

did you scrub that from the chat history?

@JohnRennie did you get it

Not yet, but especially with large attachments mail can take a few minutes to get through

5:25 AM

@JohnRennie it's a link

I'll give it five minutes ...

@JohnRennie lmao I sent it to some other John Rennie

Oops :-)

just use hangouts I guess?

Yes, send me the link through Hangouts.

5:28 AM

@JohnRennie I need to figure out whom I sent this to

I just got 4 pings from the various devices I have scattered around to say there was a new Hangouts message. Quite a chorus :-)

1 hour later…

Anonymous

6:34 AM

@0ßelö7 How's that possible ? You can't send messages to people on hangouts unless they accept your invitation

7:31 AM

1

Q: Nonlinear acoustic processes in air - how to quantitatively estimate power in four-wave mixing?

I'd like to understand if non-linear mixing of human speech with a high-power ultrasonic "carrier" in air could produce sidebands with more power than the original speech. 30 kHz to 300 kHz has a wavelength range from about 10 down to 1 millimeter in air. This is still much longer than the mean ...

acoustics non-linear-processes

I have to correct myself. There are still 22 hours of the grace period left, and an answer can still be posted now. I apparently knew this at one point. OK I won't post again about this.

ııııııııııııııııııııııı

8:04 AM

@EmilioPisanty journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.223901

It's the first all-dielectric (time-reversal symmetric) realization of a photonic topological insulator

@ııııııııııııııııııııııı a primitive cell is one that contains only one lattice point. So the cell drawn is a primitive cell.

hi everybody why earth and other planets rotate around sun... I know centrifugal force crap but i want real reasons

@aquire what would you call a real reason?

like how come the system came to this stability?

why didn't things collide into each other

They did. The early Solar System was a chaotic place with things crashing into each other all the time. The system we see now is what was left over after all the collisions.

8:12 AM

Can it be simulted?

Yes, it can be simulated and has been simulated.

Whats the probability of becoming such a chatic system to this stabe?

If you Google evolution of the solar system or something similar you should find relevant articles.

John are you student or a old man?

The probability is near 100% that the early Solar System, or any similar planetary system, will evolve into something that is fairly stable (it's unclear exactly how stable the Solar System is).

8:16 AM

can you give me real life example?

However the exact details, e.g. the number of planets and their orbital distances, are almost impossible to predict because chaotic systems cannot be modelled accurately over long times.

for such a system?

The Solar System is a real life example!

This might be an interesting starting point:

Formation and evolution of the Solar System

The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed. This model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics...

I am the solar system

u can ask me

Behold my mighty star

@Slereah not your black hole?

8:22 AM

there's no black hole in the solar system

check your facts

ııııııııııııııııııııııı

8:38 AM

For a charged particle with mass $m$ and charge $q$ moving in a plane with a magnetic field B applied perpendicular to the plane, what is the angular frequency of the circular motion????

That's the cyclotron frequency IIRC

Cyclotron resonance

Cyclotron resonance describes the interaction of external forces with charged particles experiencing a magnetic field, thus already moving on a circular path. It is named after the cyclotron, a cyclic particle accelerator that utilizes an oscillating electric field tuned to this resonance to add kinetic energy to charged particles. == Cyclotron frequency == The cyclotron frequency or gyrofrequency is the frequency of a charged particle moving perpendicular to the direction of a uniform magnetic field B (constant magnitude and direction). Since that motion is always circular, the cyclotron frequency...

you can just compute it out; $mv^2/r = qvB$

ııııııııııııııııııııııı

yes but a book I'm reading says it's $\omega_0 = \frac{qB}{mc}$

Maybe he uses cgs units or something

ııııııııııııııııııııııı

@Slereah ohhhhh right

thanks

8:44 AM

Never trust a book that uses cgs

ııııııııııııııııııııııı

@Slereah it's shankar :/

ııııııııııııııııııııııı

user image

it seems to be a popular concept among entrepreneurship promoters

Unfortunate that actual employers ask for degrees

9:00 AM

@JohnRennie Thanks grand pa!!

@ııııııııııııııııııııııı I take it it's gapped, then, so no Dirac points?

John ain't no grandpa

What's the mechanism that opens the gap?

@Avantgarde ?

Never mind. Hope your question was answered

9:04 AM

ok uncle

"uncle"

another thing @JohnRennie

@aquire Yes?

is it true that in the equation, F=GmM/(r^2) the power of r is not exactly 2 but slightly different?

If we don't go to relativity of course..

I mean only considering newtonian things

Hi aunt @Secret

If you don't include relativistic effects then it is exactly a power of 2.

i.e. exactly $r^{-2}$ not $r^{-1.9999...}$ or $r^{-2.000...}$

9:17 AM

Ah I see

Are there any equations/formulas where there are powers of irrational or absurd looking ones aunt @Secret

Relativistic effects are roughly like $\propto 1/r^2 + 1/r^3$

Since when I have a niece...

I think you also get $\ln(r)$ if you include quantum gravity effects

what is $$

Mathjax

9:20 AM

@Slereah?

111

A: Should chat have TeX support?

There are four bookmarks which are located on this installation page: start ChatJax installs MathJax and starts a loop that renders $\LaTeX$ as needed. This is intended for use in chat, where the contents of the page are not static. Reloading the page will stop the loop, so the bookmark needs t...

84

Q: Why do most formulas in physics have integer and rational exponents?

I mean, why is $F=ma$? Why not $m^{0.123}$, $a^{1.43}$ or some random non-integers or irrational? I hope you understand that my question isn't limited just to force, energy, velocity, etc.; it also extends to the area of a square, circle, etc. and all other formulas. I think the whole thing sta...

laws-of-physics

hey that's nice @Slereah

$abcd$

Thaks granny

@Secret I'm lazy to read it. It has a huge answer. Can you tell me it short?

Why nobody knows about this chat? This is awesome!!

People should advertise this chat rooms in huge $\Huge\color{ blueviolet} CHAT$ signs!!

You made this chat into a family

I posted a question in meta stackexchange and I got more than 18 downvotes!!

9:32 AM

electronics.stackexchange.com/questions/326487/… some one plz seee this doubt

They are brutal

0

Q: Confusion in Excess hole concentration

I have one confusion in the Millman'S Integrated Electronics 2E in the exponential decaying graph its saying that P'(x) is the excess hole concentration or the injected concentration but in the next page in one example it taking excess hole density as P(X) but not P'(x) Why it is so ? what...

current semiconductors homework

Basically, most models which we wrote equations on, are linear and thus the exponents are shifted by units of one. You won't see transcendental power laws unless you work with condensed matter

Did you call them grannies and grandpas?

Nope

I got to go... Thanks everyone...

Anonymous

9:53 AM

What's going on here... aunts,grannies, and uncles ? :'D

@Blue hello godfather

lol

Anonymous

Coughs ....kid, don't fool around. :-) @Avantgarde

Anonymous

@Rohit Injected hole concentration (initial): $p'(0)=p(0)-p_0$.

Anonymous

10:09 AM

That's exactly what they have done. I can't spot any mistake in the text.

Huh. A guy just barged into my room and began selling himself.

Anonymous

Excess hole density is taken as $p'(x)$ even on the first page.

Right to Privacy is a fundamental right now..

Anonymous

@Sid Did you buy him ? ;)

I had to store that guy's phone number because he insisted.

Anonymous

10:11 AM

Lol

(And apparently, he would give me some tutoring on programming languages)

And here's the catch, He said, he will teach me PHP, of all languages.

Anonymous

Weirdo

Anonymous

XD

And then, C, C++, JS and others and I have to pay him like 5000 rupees for 6 month course

(I could do all those for free in Coursera)

@Sid What guy?

10:12 AM

Dunno who.

Random guy barged into your room?

Yeah.

(But the door was open. So, I can't really complain...

Anonymous

Must be some senior...who is looking for innocent freshers

Nah. Seniors don't live near our hostel

He said he was some sort of a professor/teacher or something...

Anonymous

Professor who barges into student's rooms ? XD

10:16 AM

Tell him you can take his 'lesson' or whatever, provided you teach him one free lesson on the ancient and difficult art of knocking

Anonymous

@Sid Don't ever forget to lock your washroom door while you're in :p

lol

Anonymous

I have a crappy Sociology test on Monday..ugh

What is Sociology?

Anonymous

24 pages to muggify

Anonymous

10:19 AM

@Sid Google....:p

Too lazy. :P

Anonymous

user image

Anonymous

Stuff like this ^

Anonymous

@Sid

Anonymous

I didn't attend those classes...so I had to xerox them :d

10:23 AM

Who are those people who have left there marks in those pages?

What in the fresh hell is that?

Anonymous

@Avantgarde The people from whom I took the xerox..lol

@Sid Hell can be fresh?

It can be a lot of things. :P

I never took a sociology class. Is it like a compulsory humanities elective?

10:25 AM

"You will find yourself in the middle of Nazis of Germany, chimpanzees in Africa and warriors in South America" - I would rather not take such classes

Anonymous

Neither did I take any of those classes XD

Don't you have a minimum attendance rule or something?

Anonymous

@Sid 60% overall....but I don't think it's very strict/rigid

Humanities can be quite fun. One of my favorite classes was politics. The prof was brilliant

The rest of the humanities were not that good.

@Avantgarde True that. My English professor is awesome

10:31 AM

But yes, it depends if you really have some inclination towards a humanities subject. I liked politics and the prof was great so everything worked out. I wouldn't go to an English class even if Shakespeare was the prof

@Sid You have English in college?

Anonymous

Our English teacher is okay...not excellent

Yeah. Communicative English is what they call it

I see

Anonymous

Sociology and English are both taught to us by PhD students and not the professors

Huh... that's odd.

Anonymous

10:35 AM

Is it odd?...I guess being a PhD TA is a part time job

But this must be part of compulsory first year coursework, right?

By the way, how's your college experience going so far? @Kaumudi.H

Anonymous

@Avantgarde Yes

user84215

The room Physics Workshops has been created.

user84215

in Physics Workshops, 6 hours ago, by MathematicsAminPhysics

This room has been created to hold physics workshops. Please inform me of your suggestions to create events for them. Please note that your suggestions need not be very sophisticated; they can be elementary.

@Avantgarde Yeah.

10:39 AM

@Blue read that again in the example they took p(0) as excess hole density

@Blue Did you decide on research topic with the prof yet?

I believe you said he gave you a week's time to decide on it

Anonymous

@Rohit Oh, right. Take that as $p'(0)$

Anonymous

Anyhow, $p_0$ is very small

Anonymous

@Avantgarde Yes :)

Anonymous

over-the-air wireless charging

Anonymous

10:42 AM

I'm collecting papers and data

Anonymous

I'll visit him next week again

@Blue Interesting! What's the current progress in that field, actually? I was thinking about that the other day.

@Blue That sounds very cool actually. How much have you gathered so far?

Anonymous

It has been done for small distances of around 4 inches -5 inches

Anonymous

I'll be working on improving the efficiency

Anonymous

10:44 AM

Without using directed sources of energy like lasers

That's pretty nice. Wires have no place in this society

Anonymous

I'm thinking how to reduce the flux loss

Anonymous

During inductive-resonance coupling

What's the core idea actually?

Anonymous

Resonant inductive coupling

Resonant inductive coupling or magnetic phase synchronous coupling is the phenomenon that the coupling is enhanced when the secondary side of the loosely coupled coil resonates. The most basic resonant inductive coupling consists of one drive coil on the primary side and one resonance circuit on the secondary side. In this case, when the resonant state on the secondary side is observed from the primary side, two resonances as a pair are observed. One of them is called the antiresonant frequency (parallel resonant frequency 1), and the other is called the resonant frequency (serial resonant frequency...

10:45 AM

I mean, how is it done?

Anonymous

@Sid See the wiki link ^

@Blue without directed sources, I'm guessing, there's going to be excessive power losses into the environment?

Anonymous

mit.edu/~soljacic/wireless_power.html

Anonymous

@Avantgarde Exactly...but directed power sources like lasers can be harmful to the human body

Anonymous

I need to find an alternative

Anonymous

10:47 AM

Lasers can make one go blind

Anonymous

I need to somehow amplify the signal at intervals

Yeah that's true. Pretty interesting project

Why would you want to amplify them? What's wrong with some stable energy source?

Anonymous

@Sid Flux loss...magnetic flux from a small region gets diverged.....similar to the way you can't hear sounds at large distances

@Blue i am really crying in other promlems its effecting the result
please help me
also in some other problem if i take p'(x) as excess density result is differering

10:52 AM

@Rohit Dude, first of all, calm down. Then, tell what is your exact problem.

wait

@Sid physics.stackexchange.com/questions/354478/…

0

Q: Confusion in Excess hole cocentration

I have one confusion in the Millman'S Integrated Electronics 2E in the exponential decaying graph its saying that P'(x) is the excess hole concentration or the injected concentration but in the next page in one example it taking excess hole density as P(X) but not P'(x) Why it is so ? what ...

homework-and-exercises semiconductor-physics diffusion

Anonymous

Isn't that solved already?

Anonymous

Your book had a printing mistake

Anonymous

Leave that particular example and move on

Anonymous

$p'(x)$ is the excess conc.

10:58 AM

i saw in all edition book its like that only but millman's book people says its a zero error book

@Rohit People are lying.

There is no book on this planet that is zero error.

okay i have to leave it you are saying right thanks alot

@Blue @sid Thanks alot

Anonymous

Welcome

Anonymous

:)

(I don't even know what I did to get a "thanks" but you're welcome...)

11:02 AM

no one was helping me but ur word given me relief @Sid

:)

What are you doing, right now? If you don't mind, telling

i am studying now

Well, yeah. What are you studying? I mean, high school? College?

Anonymous

Looks like college stuff...electrical/electronics engineering I guess

Looks like EEE to me, yeah

11:05 AM

Graduated electronis engineering but preparating for competitive for master

yeah its ECE

Anonymous

Oh. Nice. You're gonna appear for GATE? Which university are you from?

Anonymous

:)

OH YES GATE

Cochin University

what about u?

Anonymous

I see. Good luck! :)

Anonymous

@Rohit I'm a first year ECE student at Jadavpur University, Kolkata.

11:09 AM

Ohhh Great....

@Rohit GATE happens twice, I think.

When is it? November?

feb

Oh.. you have a lot of time.

Anonymous

@Sid Time is never enough :P

Hmm, I seem to finally have some motivation now...

I was pretty much exhausted and drained after 12th.

Anonymous

11:14 AM

Same here....I can finally learn things which I want to :D

@MathematicsAminPhysics: I think what you're trying to do is worthwhile, but you'll just annoy people if you keep on at it. This isn't a question about physics and shouldn't have been posted on the site.

user84215

@JohnRennie But I have seen many questions about learning physics on the PSE.

The site is for questions about physics. Not for thinly veiled adverts for your physics workshops.

Anonymous

@MathematicsAminPhysics This is a site for asking Physics questions. Not about how to learn Physics.

@MathematicsAminPhysics As I say, I think the PSE is a good opportunity for the sort of workshop you suggest, and indeed that sort of thing happens though ona less formal basis.

Anonymous

11:19 AM

Your question might have been more suitable on Meta...but I doubt that

We quite often get long discussions in the chat where students want to learn about some aspect of physics ... or indeed maths.

user84215

@JohnRennie I have asked a question about the process of learning physics. This is bad?

@MathematicsAminPhysics Yes, it's off topic and your question will be quickly closed. It has already attracted two close votes even though the site is quiet at the moment.

Anonymous

@MathematicsAminPhysics It's not bad. This site is not suited for those type of questions as it is not a forum.

Anonymous

You can of course ask such questions in chat

user84215

11:23 AM

@JohnRennie @Blue Questions about learning physics are off-topic?

@MathematicsAminPhysics yes

Anonymous

@MathematicsAminPhysics Yes.

Anonymous

Even book-recommendation questions have to adhere to some rules

You should just ask the question here in chat. Here, you will get replies

Anonymous

user image

Anonymous

11:29 AM

Is it possible to get rid of the junk with the free version of AVG ?

user84215

I did not know it.

Anonymous

lol

Anonymous

It shows that I have to buy the premium version or it won't clean my pc

Anonymous

@JohnRennie Any free alternatives to this AVG which can clean the junk files on Windows? :p

@Blue you don't need to clean Windows in the way AVG suggests

They are just trying to get you to pay for something that isn't really necessary.

user84215

11:33 AM

Please do not close my question.

@MathematicsAminPhysics your question is doomed. Sorry.

user84215

I did not know.

Anonymous

@JohnRennie Umm...how do I clean then? I don't know which files are junk....and tbh my laptop seems to be getting slow

@Blue there is a Windows app called cleanmgr you can run from time to time to clean up stuff. Press Windows-R and when asked what you want to run type cleanmgr.

Laptops have a tendency to slow down with age because increasing amounts of crap get installed on them. The sort of cleanup that AVG, or even cleanmgr, does will have little effect on the speed.

Anonymous

@JohnRennie That works! BTW should I format my disk in that case? (I don't have the installation CD though)

11:36 AM

The only good solution is:
(a) do a clean reinstall of Windows including a complete disk wipe
(b) don't install anything you don't need in the future

Oh good old diskcleanup

Is it Windows 7 or 10?

Anonymous

Windows 7

Anonymous

4 year old laptop

Is there a licence sticker on the laptop?

Anonymous

11:38 AM

Nah...all those stickers got removed due to wear and tear

Anonymous

It's Latitude E4310

Download and run Belarc Advisor and that will tell you your Windows key (along with all other licence keys). Keep the info safe.

I would suggest you install Windows 10. You should find your Windows 7 key will work with Windows 10.

You can download the Windows 10 install files from the Microsoft site and put them on a USB key (or DVD).

Anonymous

user image

Anonymous

Will it show the key automatically?

Anonymous

It says "Preparing...

11:42 AM

Yes. It will run and generate a report and the report will show the key (along with lots of other stuff).

BTW you can download the Windows 10 install files here

Anonymous

@JohnRennie Is Windows 10 free? I thought it was paid

It isn't free, but if you own a legal copy of Windows 7 then that key gives you a free upgrade to Windows 10.

Anonymous

@JohnRennie I see. Alright...thanks a ton! I'll try installing it tonight

How much memory does your laptop have?

Windows 10 really needs 4GB

If your laptop only has 2GB then W10 will struggle a bit.

Anonymous

40 GB (C drive) and 70 GB (D drive)

Anonymous

11:45 AM

Free memory

@Blue are those two separate disks, or a single disk paritioned into two?

:39719474 yes I meant RAM

Anonymous

@JohnRennie Separate disks

Anonymous

@JohnRennie I don't know...checking

Anonymous

@JohnRennie It has only 2 GB RAM ;_;

Hmm

Anonymous

11:51 AM

Maybe I can just install something open source like Linux ?

I don't think W10 will run any slower than Win7 does. Especially if it's an old install of Win7 that has slowed down with time.

Anonymous

@JohnRennie Probably...I guess if Win10 doesn't work well I can downgrade to Win7 again

The single biggest performance upgrade you could do would be to replace the two disks with an SSD.

That would make a tremendous difference.

But you'd need a 128GB SSD, or bigger, and they are quite expensive.

About 4,000 rupees

Anonymous

I'd rather buy a cheap new laptop next year :P I'll need to get through this year with this old one

If the laptop is working then there is something to be said for just struggling on with it. As long as it's not unusably slow.

Anonymous

11:55 AM

BTW it is still not showing the key

Does it still say "preparing report"?

Anonymous

user image

Or is it still at:

14 mins ago, by Blue

user image

Anonymous

Yeah...still there

Ah you need to click Yes or No before it will do anything. Click No as it will be faster.

Anonymous

11:57 AM

Oh lol...I thought that was for something else

Anonymous

I clicked on No

It should only take a minute or so ...

Why do you think somebody downvoted my question? physics.stackexchange.com/questions/354489/… :O

@apt45 don't know, the question looks OK to me, though I'm afraid I on't know the answer. I guess it's not that clear what you are asking.

@JohnRennie For example, what do you think I am asking for?

Anonymous

12:01 PM

user image

Anonymous

55041-013-1417976-86493

Anonymous

This is the key, right?

Anonymous

and (Key: ends with 9QMF7)f

No, the key is 5 groups of 5 letters.

Anonymous

What? Where do I find it?

12:04 PM

Incidentally don't post your keys here or someone could copy them!

Anonymous

Oops :P

Anonymous

Okay...but where is the key?

I'm just running Advisor on one of my PCs to check ...

user84215

So, should I post my question on the Meta?

Anonymous

a. Processor clock speed is measured at computer start-up, and on laptops may be impacted by power option settings.
b. Data may be transferred on the bus at one, two, or four times the Bus Clock rate.
c. Memory slot contents may not add up to Installed Memory if some memory is not recognized by Windows.
d. Memory slot contents is reported by the motherboard BIOS. Contact system vendor if slot contents are wrong.
e. This may be the manufacturer's factory installed product key rather than yours. You can change it to your product key using the procedure at http://www.belarc.com/msproductkeys.h…

Anonymous

12:09 PM

Oh....see point f

That's odd, I get:

user image

Anonymous

I forgot to mention that I had downgraded from Windows 8 to Windows 7 during the first year...perhaps that's the reason

@Blue ah, The full product key is not stored on this computer

Aha!

In that case you don't need a key

When you do the W10 install it will read the key that's stored in your computer UEFI BIOS.

Anonymous

@JohnRennie Then? How?

Anonymous

@JohnRennie Oh...I just need to download and install the W10 files...that's all?

12:13 PM

@Blue Yes.

For W8 and later there is no key.

Anonymous

Alright...I'll try it and let you know! :D

Anonymous

Thanks

Dell will have programmed the key into the laptop BIOS so it's read automatically by the installer.

When you do the W10 install I would completely wipe the disk. Don't try to upgrade th W7 install or it will inherit all the stuff that'scurrently making W7 slow.

Anyway, I need to go and get lunch.

user84215

If I delete that post, it will have a negative effect on my account?

Back in a few hours

@MathematicsAminPhysics Deleting one post won't hurt. If you post then delete several posts the SE might decide you're a problem user, but deleting one post shouldn't hurt.

user84215

12:18 PM

@JohnRennie Thanks. So, I should post it on the Meta?

12:48 PM

@JohnRennie so did you read it

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