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Physics : Recent Questions and Answers (Page 682)

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

Why does water get significantly colder while falling through the air?

I think we've all experienced this effect. You turn on the shower and the stream of water at the shower head is a fair bit hotter than the water towards...

Asked on 01/03/2021

2 answer

What time does the particle reach the screen in this thought experiment?

Suppose a particle with a gaussian wavefunction moves to begin with towards a position detector screen. How do we obtain the 'Time of arrival' distribution, when time can't be an...

Asked on 01/03/2021 by BIGFATNIH

5 answer

Cherenkov radiation

Cherenkov radiation is electromagnetic radiation emitted when a charged particle passes through a dielectric medium at a speed greater than the phase velocity of light in that...

Asked on 01/03/2021 by Andrei Geanta

2 answer

Does an electron in an orbital have exactly the same energy as the orbital's shell?

Solving the Schrödinger equation gives a wave function for each electron in an atom of any element. The wave functions under the atom can be squared to yield probability distribution...

Asked on 01/03/2021

1 answer

Contribution to the emblackening factor from massive gravitons

I have been studying the effects of massive gravitons on the emblackening factor $f(r)$; i.e., given a Reissner-Nordstrom AdS geometry $$ds^2=L^2 left(frac{dr^2}{f(r)r^2}+frac{-f(r)dt^2+dx^2+dy^2}{r^2} right)quad(textrm{Eqn. } 1) $$and...

Asked on 01/03/2021 by Joshuah Heath

0 answer

Electromagnetic fields inside perfect conductors

Why are electromagnetic fields zero inside perfect conductors? I do not understand why we can make these assumptions in electrodynamics.SOLUTION: Firstly, we are going to analize the electric field....

Asked on 01/03/2021

1 answer

Why does metal change its color under polarized light?

I've taken two photos of a metal in an experimental setup. ...

Asked on 01/03/2021 by akuzminykh

2 answer

Why can't work be done by dark energy on cosmic scales?

My rudimentary understanding of dark energy as the cosmological constant is that the vacuum state of space has positive energy but negative/repulsive gravity/pressure. Given a system dominated by "positive" gravity...

Asked on 01/03/2021 by J Kusin

1 answer

Adiabatic volume change of an ideal gas thought process

I am struggling with trying to solve the following problem, attempting just (a) and the first part of (b) for this exercise:During a reversible adiabatic volume change of an ideal...

Asked on 01/03/2021

2 answer

How could I see the distance light traveled from an airplane?

It was nighttime. I was flying on an airplane. As we were landing we passed over a highway. I saw cars below with their headlights on. I could see that...

Asked on 01/03/2021 by iamsad

3 answer

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