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Physics : Recent Questions and Answers (Page 580)

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

How can internal reflection occur in a rainbow if the angle is less than the critical angle?

In the explanation for rainbow formation, it is said that the spherical droplet refracts and then Totally Internally reflects the incident sunlight. But examining the angles suggest ( see fig...

Asked on 02/09/2021

3 answer

Killing vector index manipulation

I was doing some problems of the book "Problem Book in Relativity and Gravitation by A. Lightman, R. H. Price" and on problem 10.14 I dont understand why they say:...

Asked on 02/09/2021

1 answer

What was the need for doing experiments to prove quantum entanglement?

This question comes from someone who is interested in Physics but with no theoretical background. In 1936, EPR presented the thought experiment which later came to be known and quantum...

Asked on 02/09/2021

6 answer

What is difference between 9.8 N (Kgwt) and 9.8 m/s^2 (g)?

What is the difference between 9.8 N (aka Kgwt) and 9.8 m/s^2 (aka g or gravity)?Or in a more general sense what is the difference between kg weight and...

Asked on 02/09/2021

1 answer

Universal limit on speed of signal transmission

Einstein, in his 1905 paper On the Electrodynamics of Moving Bodies, famously uses two postulates to derive the Lorentz transformations:The relativity postulate: the laws of physics are invariant in all...

Asked on 02/09/2021

1 answer

How can ideal gases be "elastic" and "ideal" at the same time?

The elastic properties of any substance is because of the restoring intermolecular forces operating in it. And I read that the isothermal elasticity of an ideal gas is given by...

Asked on 02/09/2021 by A student

1 answer

Which one of them is the time-reversed wave-function, $psi^{ast }left( x,tright) $ or $psi^{ast}left( x,-tright) $?

If the wave function $psileft( x,tright) $ is a solution of the spinlesstime-independent Schr$ddot{mathrm{o}}$dinger equation,$$ihbarfrac{partial}{partial t}psileft( x,tright) =left[ ...

Asked on 02/09/2021 by Hanks

1 answer

How does a cavity mimic a black body when emitting radiation?

Suppose the interior of the cavity is made of a non-black body. Then in thermal equilibrium, the spectral radiance of the non-black body, say $R_T^*(nu)$, will be different from...

Asked on 02/09/2021

4 answer

Will sound wave travel faster if we are traveling while speaking?

I don't know if this is a stupid question or not, please tell me if it is. I will use an example to illustrate my doubt. Suppose I am moving...

Asked on 02/09/2021 by Learning Mathematics

1 answer

Shockley diode equation - temperature influence

when looking at Shockleys ideal diode equation I wonder what "meaning" the temperature has in there? If I assume $$I(T) = I_0 left(exp left( frac{U}{k_BT/q}right)-1 right)$$ and vary the...

Asked on 02/09/2021 by Nikolaij

0 answer

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