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Physics : Recent Questions and Answers (Page 48)

Find answers to your questions about Physics or help others by answering their Physics questions.

Work done on object being carried upwards

If you carry a book in your hands, and you walk up stairs with a change in height of $h$, the net work on both you and the book...

Asked on 10/03/2021

2 answer

Electromagnetic wave and skin depth, skin effect

In EM theory concept of skin depth is induced which is a measure of how much a EM wave can penetrate the medium, from it arises the concept of...

Asked on 10/03/2021

1 answer

Effect of temperature on the Fermi level in a semiconductor

In intrinsic semiconductor, i have learned that fermi level is weakly dependent on temperature and it is sited between Ec and Ev. In this case, I have some questions.What...

Asked on 10/03/2021 by Quantumboy

2 answer

Non-linear regime of matter power spectrum

Question 1 I was trying to understand why cosmologist calculate the matter fluctuations in spheres of $8 h^{-1} Mpc$. I look for information and I ...

Asked on 10/03/2021

0 answer

Phase factor in the equal time commutation relation in Klein-Gordon field

Two related questions regarding the equal-time commutation relation in the Klein-Gordon field (I suspect they have the same/very related answers): In the following notes http://www-thphys.physics.ox.ac.uk/people/FabianEssler/C6web2012/theory/canonical.pdf, they have:...

Asked on 10/03/2021

1 answer

RC circuit: is order of resistance and capacitor important?

in a RC circuit is order of resistance and capacitor important? Typically there is the battery then the capacitor then the resistance, but is it ok if I draw with...

Asked on 10/03/2021 by jean marc

1 answer

Why is the conservation of momentum not equivalent to the conservation of energy in Newtonian mechanics?

Conservation of momentum is Newton's third law. Conservation of energy is attained in theory by defining work, deducing the work-energy principle and specifying that if a force or system is...

Asked on 10/03/2021

3 answer

Conservation of momentum on a zero-friction floor

If we have an object of a certain mass that's moving on a non-friction floor with a certain velocity v, and we suppose that at some point we take off...

Asked on 10/03/2021 by M.Taki_Eddine

2 answer

What is the CFT dual of the stress tensor in the bulk?

I am new to AdS/CFT. I know that the dual of the bulk metric is the CFT stress tensor but what about the dual of the bulk stress tensor? I...

Asked on 10/03/2021

2 answer

"Zero overlap" of initial and final states in meson to nucleon + antinucleon scattering of scalar Yukawa

I'm currently studying QFT from David Tong's lecture notes and video lectures. In meson to nucleon + antinucleon decay (section 3.2.1 inthis ) in scalar Yukawa theory...

Asked on 10/02/2021 by JohnnyMo1

1 answer

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