« first day (2765 days earlier)      last day (38 days later) » 

HNQ
7:53 AM
1
Q: What ties high frequency electromagnetic waves to short wavelength and converse?

kuritoWhy is it not possible to have waves with high frequency (high energy) and great wavelength and converse? What physical quantity ties frequency to wavelength in an inversely proportional way?

2
Q: What oscilloscope spec to use?

SunI want to measure a pulse signal using an oscilloscope. The expected rising edge of the signal is in the 1 to 5 ns scale. I have a 20 MHz oscilliscope. Is it correct that the rising edge of the oscilloscope would be limited to 17.5 ns? In other words, do I need to use a faster oscilloscope? How d...

 
HNQ
8:17 AM
5
Q: Are neurons more energy efficient than transistors?

user1576720In terms of order of magnitude, how does a the energy consumption of a typical mammalian neuron (in the brain) compare with the state of the art MOSFET?

 
 
2 hours later…
HNQ
10:22 AM
2
Q: Is the temperature of light affected by color filters?

TristanThis video demonstrates how varying color filters alter the energy of photoelectrons emitted from a light source: https://www.youtube.com/watch?v=kcSYV8bJox8 But I am confused by what these different colors having different "energies" means. Blue light is said to have more energy than red light. ...

 
 
11 hours later…
HNQ
9:34 PM
2
Q: Why is a force distributed over an area? Why couldn't the stress be directly equal to the force?

user134613So, my question might seem silly. I know in real life when we apply a force with our hand and push on lets say a cylinder , we know the force will be distributed over the cross section of the area, so if we had a wider area, we need more force, and if we had smaller area, then we need less force ...

 

« first day (2765 days earlier)      last day (38 days later) »