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Physics : Recent Questions and Answers (Page 16)

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

Electrons are 3 dimensional quantized waves (wave functions)?

I thought that electron wave functions were only mathematical of were to find the electron. Why don't atoms collapse if they are mostly empty space?...

Asked on 12/08/2021

3 answer

Difficulty understanding the energy transformations during resistance in a circuit

I am currently having problems understanding the energy transformations that occur when resistance in a solid conducting wire restricts current flow. From my understanding, resistance in a solid copper conducting...

Asked on 12/08/2021

1 answer

Is light reflection or any other reflection a type of force?

I have raised this question as during reflection the direction of the ray is changed. Force is created by the particles(bosons). so, are reflections a type of force?...

Asked on 12/08/2021

3 answer

Torque on a block on an inclined plane

When a block is stationary on an inclined plane, the frictional force on the base of the block has a torque about the center of gravity of the block. However,...

Asked on 12/08/2021

1 answer

Physical intuition for spatially constant motion in the XY-model in 2+1D

The XY-model on a 2-torus ($L_1,L_2$) has a lagrangian given by$$L_{XY}[theta] = int d^2 x frac{chi}{2}big{(}dot{theta}^2 - (partial_x theta)^2big{)}$$Fourier expanding $theta$ as...

Asked on 12/08/2021

0 answer

Negative energy density

There are some universe models where $Lambda < 0$. In this case, the energy density of the dark-energy becomes negative. At this point, does it make sense to talk...

Asked on 12/08/2021

1 answer

What is the difference between entropy generation and entropy transfer?

When I want to calculate the entropy change of a system with two bodies with finite difference in temperature in an isolated system in thermal contact, do I calculate the...

Asked on 12/08/2021

4 answer

Nodes in Spherical Harmonics

In Rydberg Atoms book by Thomas F. Gallagher, Page 14, the author provides the general equation of spherical harmonics which is well-known. He states that there exist $l-m$ nodes...

Asked on 12/08/2021

0 answer

Tensor product of two Hilbert spaces

Does tensor product of two Hilbert spaces explains interactions between the systems also? Or is it just the way to represent two spaces in a combined fancy way?Let me...

Asked on 12/08/2021

3 answer

Where are the electrons of a cathode ray tube coming from when using AC?

I see in this picture a beam of electrons leaving the cathode. But I read before, that the electrons can flow out of a copper wire only, if they are...

Asked on 12/06/2021

3 answer

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