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Physics : Recent Questions and Answers (Page 331)

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

Gas bottle stuck to the floor, why did it happen?

So I decided to do some bbq for new year's eve. It's snowing here and the floor may be below 0. What I would have never expected is that...

Asked on 05/17/2021 by daniel sp

1 answer

Kerr black hole horizons and infinite redshift surfaces

In the Kerr black holes we have infinite-redshift surfaces (where a infalling body is still according to the asymptotic observer) and event horizons (the escape velocity becomes greater than the...

Asked on 05/17/2021 by lytex

2 answer

Weak measurement and distinguishability

Suppose you can perform any weak measurement of your choice on an ensemble of particles composed of two equally sized sub-ensembles, but you can't use any other source of information...

Asked on 05/17/2021 by triclope

0 answer

Why fiber optic cables looks colorful?

I wanted to know why fiber optics look green or blue, isn't it that it uses total internal reflection, so light shall remain in it? I think may be it's...

Asked on 05/17/2021

1 answer

Mathematically calculate heat capacity in varying pressure and volume conditions

I understand that the heat capacity depends on depends upon both microscopic (molecular/atomic) and macroscopic (phase, temperature, pressure). If I have an environment wherein both - the pressure and volume...

Asked on 05/17/2021 by Dexter

1 answer

Why isn't the capillary tube displaced downward by the column of water?

Water moves upward in a capillary tube due to intermolecular forces between water and the glass wall of the capillary tube. If those forces act on water pushing it up,...

Asked on 05/17/2021

1 answer

Kelvin-Planck second law of thermodynamics statement

I have learned in thermodynamics that it is impossible for a cyclic system that is receiving energy as heat from one and only one thermal reservoir to produce a net...

Asked on 05/17/2021 by Michael Tamajong

1 answer

Why does the intensity of an uncollided beam of neutrons post-target drop off exponentially with the thickness of the target?

I guess I would have thought it was linear. The exponential dropoff surprised me and I don't understand why it's the case--can someone explain?...

Asked on 05/16/2021

2 answer

Real part of refractive index

I would have a quite stupid question: What is the connection between complex refractive index and the "normal refractive index" that I find in every high school books? Is that...

Asked on 05/16/2021

3 answer

Electron in magnetic field

Consider an electron moving in the plane with a perpendicular constant magnetic field. It is well-known I think that the direction of motion can be changed by the magnetic field...

Asked on 05/16/2021

4 answer

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