Ankit

can someone tell me about ellipsometry. What exactly is the modelling part of it ?

how good is the snapping part ? like how much will it affect the edge thickness ?

yeahh placing the film facing its cross section along the beam path

@JohnRennie I read about cutting the substrate with film deposition and then exposing the cross section in SEM but I am not sure if that would work as I have never tried anything like that

@JohnRennie we want it to be of the order of 100nm..

I need some help guys. Actually I am trying to get an ultrathin film of Polystyrene on a glass substrate using spin coating. Now the thing is that I really don't know how would I measure the thickness of the film. Could you guys suggest some of the ways I could try out.

@ACuriousMind but wait thermodynamics says that it is possible to give heat to a system without actually getting any temperature change. The whole energy just goes into work done on the surrounding.

What should I answer him ? Can someone explain

A high school student asked me this question:- say we have a closed gaseous system(ideal gas) and we heat the system isothermally then since the system is expanding the center of mass will move from its initial position but then there is no external force acting on the system so how is that possible ?

But I couldn't really see this equivalence from matrix representation

@SillyGoose yeah if i take dagger both sides and then use the fact that the eigenvalue of adjoint operator is conjugate of the eigenvalue of the given operator , I will get the second equivalence which I was asking for

@SillyGoose yeah to some extent

Someone please clarify

I don't really think its true as I couldn't get it when i was trying to see it using matrices but my instructor gave us something similar to this to be true

Say there is an operator O^ such that <m|O^ = m<m|.. then can i say that O^|m> = m|m> ???

@everyone I had some confusion with dirac notations in QM

Hey can someone here suggest some topics that I should read to understand this weird kind of motion ? Or some references?

Can anyone help ?

We have a minimum value of frequency for which photoelectric emission occurs for every metals .. So is there any similar minimum electrostatic field strength at which field emission occurs or is it just observable for any field strength ??

We have a minimum value of frequency for which photoelectric emission occurs for every metals .. So is there any similar minimum electrostatic field strength at which field emission occurs or is it just observable for any field strength ??

Should I ask it on the site ??

I don't know if we could measure the speed of light using this experiment but I think it could help us in deciding whether the speed should be different in different directions or not .

I saw the Veritasium video on the one way speed of light and I have a doubt (more like a clue to that video btw ) with that. So I hope someone here could help me out.. Can we use the fact that the photoelectric current doesn't depend on the direction from which the photons are coming as long as the exposure area is kept the same ??

If the speed of light was different in different directions wouldn't that have created a chaneg in photoelectric current if the position of the light source was changed ?

@ACuriousMind okay.. so does that transformation account for those differences in their properties ?

@ACuriousMind so complete electric fields in one frame becomes magnetic field in the other . But shouldn't both have the same properties then ?

Can someone help me out.. I have been taught that electric field and magnetic fields are like two different faces of same coin . They are just the same thing viewed from different perspective. But if that's true : Why does one form a closed loop while the other can't ?

Also do the quarks inside a proton experience coulomb force because of charges on them ?

Can someone explain what does "decay" mean in nuclear physics ? I know about some nuclei decays into lighter nuclei to get stability but that lighter nuclei can be assumed to be a part of that decaying nuclei (together with some more nucleons) . So can we similarly say that an electron is a constituent of a W- boson because W- bosons decay into electrons and anti neutrino ?

Ha ha 😅

@JustJohan can you ask or add Buraian as our third member ? He is also from Kerala

@JustJohan I have emailed you ..

Also I think we should get online together because we can't chat in this disordered pattern (are we increasing the entropy of the universe by chatting ?) .. so suggest a time when you will be free.

But thanks for asking and I would like to be in your team

You can also ask someone else (instead of me ) to be in your team .. but definitely it would be a good experience ..

@JustJohan it will be great pleasure to be in your team.. but I don't know whether I would be able to solve those numericals or not..

@JustJohan okay I searched for it. .. I had never heard of it.. but a great exam.. I would love to give this Olympiad.. but I am not so sure whether I would be able to solve those questions.. but I would love to try.. what do you think ?

@JustJohan what's that ?

@JustJohan bye.. have a great day

Nice..

@JustJohan what about you ?

I love physics and will make my career in it..

Because I am not studying for employment..

Cool

@JustJohan may I know why ?

Btw I am not preparing for jee .. are you ?

@JustJohan haha. Most common indian name..lol

@JustJohan Ankit..

@JustJohan do you want to know how I came to know about Feynman lectures ?