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Physics : Recent Questions and Answers (Page 222)

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

Does relativistic quantum mechanics really violate causality?

The Hamiltonian $H=sqrt{p^2+m^2}$ defines a one-particle quantum mechanics in the usual way. Let us call this theory RQM for short. Peskin and Schroeder claim that RQM violates causality...

Asked on 06/30/2021 by Sam Gralla

3 answer

Young's Double Slit Experiment: Angle between incoming waves

Consider the experimental setup for Young's Double Slit Experiment: Here there is an angle between the directions of propagation of...

Asked on 06/30/2021

1 answer

Does humidity make cold air feel colder?

I sometimes hear stories where people compare their feelings in winter in different places in the world. It goes likein city X the temperature was the same as in city...

Asked on 06/30/2021 by user27542

5 answer

Different definitions of exterior derivative

In Sean Carroll's GR book, pg 84, the exterior derivative $d$ is defined as$$(dA)_{mu_1mu_2...mu_{p+1}} = (p+1) partial_{[mu_1}A_{mu_2...mu_{p+1}]}tag{2.76}$$where $A$ is a $p$-form and the RHS...

Asked on 06/30/2021

2 answer

Distinguishable, indistinguishable paramagnetic ideal gas

In the canonical ensemble, the partition function for an ideal gas is given by: $$frac{Z}{N!}$$ The factor $N!$ accounts for the indistinguishability of the particles of the ideal gas. What...

Asked on 06/30/2021 by vectorize7891

4 answer

Light scattering on the rotating black hole in the Kerr geometry

To simulate light scattering on the rotating black hole we have used this paper and this code. First, we made animation for light beam scattering in...

Asked on 06/30/2021 by Alex Trounev

1 answer

Why do we sometimes say that we can use momentum conservation if time period is small and other we don't?

In this stack and this other stack which I had asked, there was discussion on when you can apply momentum conservation in collisions. The conclusion was that...

Asked on 06/30/2021

1 answer

Flow through constricted tube, gradual pressure increase?

In a tube with a thick segment, then a thin segment, does pressure increase gradually as the fluid approaches the narrowing, or is it uniform through the entire length of...

Asked on 06/30/2021

0 answer

How do the evanescent waves contribute/cause a diffraction limit?

In the following article, under the section Physics of the Superlens, it is stated:The light emitted or scattered from an object includes not onlypropagating waves but...

Asked on 06/30/2021 by schn

1 answer

Why is Power caused by the driving force?

Say we have a car on a rough inclined plane, the maximum constant velocity at which the car can travel is $ V $, the driving force is ...

Asked on 06/30/2021

1 answer

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