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Physics : Recent Questions and Answers (Page 159)

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

Doppler cooling Ethanol

Is it possible to use laser cooling to cool Ethanol in it's gas phase? I've seen research on IR diode cooling when you reverse the electrodes but laser cooling was/has...

Asked on 07/26/2021

0 answer

How Would Projectile Motion Be Described in Non-Euclidean Space?

If I and a friend found ourselves in a world described by spherical geometry (as simulated in this linked video https://youtu.be/yY9GAyJtuJ0 ) how would the kinematics equations...

Asked on 07/26/2021 by Jeff Gustafson

1 answer

Is pressure from surface on cylinder = weight of cylinder when in water?

Written here are net forces acting on a body. But I am having difficulty in understand them after reading from textbook and online material. In the...

Asked on 07/26/2021

1 answer

Hydrogen radial wave function infinity at $r=0$

When trying to solve the Schrödinger equation for hydrogen, one usually splits up the wave function into two parts: $$psi(r,phi,theta)= R(r)Y_{ell,m}(phi,theta).$$ I understand that the radial part usually has...

Asked on 07/26/2021 by joshlk

5 answer

Wigner threshold law in photodetachment and photoionization

I am writing this question here because I have a problem in understanding the Wigner Threshold law in Photodetachment and Photoionization. The Wigner Threshold Law is given by: $$sigma=E^{L+1/2},$$...

Asked on 07/26/2021 by albedo

2 answer

How to derive group velocity dispersion (GVD)?

I'm trying to arrive to the following expression to group velocity dispersion: $$text{GVD} = frac{lambda^3}{2 pi c^2} frac{d^2n}{d omega^2}.$$ I know that GVD can be expressed...

Asked on 07/26/2021 by gvd

0 answer

How do we determine the damping coefficient given the acceleration vs time graph of a 1D mechanical system?

Consider a mechanical system about which the only data we have is a graph that shows acceleration vs time. I would like to figure out what the damping coefficient ...

Asked on 07/26/2021 by rayshawn240

2 answer

Given a crystal with mirror symmetry along a lattice plane, how to find the correspond plane in first Brillouin zone

Given a crystal with mirror symmetry along a lattice plane, how to find the correspond invariant plane in first Brillouin zone?...

Asked on 07/26/2021 by JensenPang

0 answer

Is the electroweak force similar in behavior to electromagnetism and the weak force or is it completely different?

Does the electroweak force govern particles in a similar manner to the electromagnetic and weak forces, and is therefore just an easy label or does it do something completely different?...

Asked on 07/25/2021 by eaeaa1232

1 answer

I've a problem understanding Absolute Gravitational Potential Energy?

My current concept about potential energy is that 'If work is done on a body when it is at a point (taken as zero P.E), it covers some distance. Afterward,...

Asked on 07/25/2021

3 answer

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