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Physics : Recent Questions and Answers (Page 606)

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

Why do two 'transverse waves' travelling in same medium have the same wave speed?

Why is it that two transverse waves travelling in same medium have same wave speed? What does the medium has to do with it? I have searched through the web,...

Asked on 01/30/2021 by SM Sheikh

3 answer

Understanding proper-time as "evenly spaced gradations" on the worldline?

In this video series on relativity, proper-time is explained as "evenly spaced gradations" along a particle's worldline. Here is a screenshot: ...

Asked on 01/30/2021 by jnez71

2 answer

Why do we need diffusion currents to explain semiconductor current flow?

Why do we need the idea of carrier concentrations to explain current flow? Can we simply not associate the disparity in carrier concentrations between two samples to a disparity in...

Asked on 01/30/2021 by Adil Malik

2 answer

What is the generalization of the path integral to the case of particle interaction?

I can hardly remember, so please correct if I am mistaken. In path integral formulation, the probability of detecting a quantum particle at a given point in space is calculated...

Asked on 01/30/2021 by Honor Photos

1 answer

About field operators

I put the question right now, writing some definitions later. I want to calculate $ ||hatPsi^+(x)|0rangle||^2$, where $$hatPsi^+(x) = sum_{k = 1}^{infty}u^*_k(x) hat a^+_k$$is a field...

Asked on 01/30/2021 by MattiaBenini

1 answer

How to calculate the total torque for a rod whose axis of rotation keeps changing due to external force

Suppose I have a rod of length L and mass M. I swing the rod by holding at one end. I need to compute the total torque acting on the...

Asked on 01/30/2021 by Rakesh Prasad

0 answer

When I use a sinusoidal function to describe a lightwave what do I actually have as units of measurements on the X and the Y curve?

I need some help to understand what would be the standard units of measurements on the Y-axis when representing lightwaves as a sinusoidal function. I understand how light works in...

Asked on 01/30/2021 by Agnete Thomsen

1 answer

Physical significance of electrons with negative effective mass. Are they holes or what?

For metals,the conduction band is less than fully filled,the effective mass $m^*=hbar^2Big(frac{d^2E}{dk^2}Big)^{-1}$ is positive for the interval $kin[-frac{pi}{2a},+frac{pi}{2a}]$ of the first Brillouin zone, andnegative for the intervals ...

Asked on 01/30/2021

1 answer

Obliquity factor in Huygens principle

What is the derivation of the obliquity factor (intensity proportional to 1+cosø,where ø is the angle between direction of wave propagation and wavefront tangent at some point...

Asked on 01/30/2021 by user157588

1 answer

Do electrons have no hair, like black holes?

Does John Wheeler's conjecture that black holes have no hair apply to electrons? Can the electrons have some hair that I can't see?...

Asked on 01/30/2021

1 answer

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