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Physics : Recent Questions and Answers (Page 537)

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

Dissipation and first law of thermodynamics

Consider the following situation: a certain gas is contained in a well-insulated cylinder with a well-insulated piston head. Now, in this case the piston is not frictionless. In order for...

Asked on 02/24/2021

3 answer

Is there any noise in or around cumulus / cumulonimbus clouds?

From the ground you obviously cannot hear any sound from a developing cumulus cloud, no matter how vigorous it is. BUT: Are there sound waves generated, e.g. at the cloud...

Asked on 02/24/2021 by Aziraphale

2 answer

What do spacelike, timelike and lightlike spacetime interval really mean?

Suppose we have two events $(x_1,y_1,z_1,t_1)$ and $(x_2,y_2,z_2,t_2)$. Then we can define $$Delta s^2 = -(cDelta t)^2 + Delta x^2 + Delta y^2 + Delta z^2,$$ which...

Asked on 02/24/2021 by Gold

5 answer

Bosonic Bogoliubov transformation

In the Bogoliubov theory for the weakly interacting Bose gas, the Bogoliubov transformation from bosonic creation (annihilation) operators $hat{a}_p^{(dagger)}$ to the new set of creation (annihilation) operators ...

Asked on 02/24/2021

1 answer

Diffraction spikes using diffraction grating slide and white light

I recently completed an experiment using white light through both a circular aperture and four-piece diffraction slide at the same time. I'm trying to qualitatively explain what I'm seeing, which...

Asked on 02/24/2021 by physkid

1 answer

What is total magnetic flux through a coil?

According to Gauss's law of magnetism, the total magnetic flux through a closed surface is zero. But during induction, we study that the magnetic field lines passing through a coil...

Asked on 02/24/2021 by OFFplanet

2 answer

Definition of Phase Shifts (Coupled Oscillators)

I was wondering if maybe someone could look at this excerpt from a textbook (Attached). It states that “the displacement of the two masses will be in opposite directions (out...

Asked on 02/24/2021

2 answer

2 connected tubes filled with water, placing a stopper in one and raising the other, how can I determine pressure exerted onto the stopper?

If I have two 20ml test tubes connected at the base via a thinner flexible U-shape tube and I pour a set amount of water (40ml) into one test tube...

Asked on 02/24/2021 by materialseng

1 answer

Can a curtain create a focused image on an opposite wall?

This video* (linked at the correct time of 0:26 sec) shows a scene inside a room of a home. Apparently projected on the wall is an imperfect...

Asked on 02/24/2021

1 answer

Purcell enhancement at an angle: Direction of charge oscillation

It is well-known that a hydrogen atom in free space prepared in an excited state, for example $left| 2p_y rightrangle$, will over time decay into the ground state ...

Asked on 02/24/2021

1 answer

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