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Physics : Recent Questions and Answers (Page 843)

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

Is there a state beyond gas?

If you could boil water in a sealed container until it became vapor and you still kept applying heat to it would something happen? Maybe gas to super-gas?This...

Asked on 08/11/2020 by Ayush Madan

6 answer

Understanding thermal radiation in a conductor, gas and insulator

Context:I was in my bliss of ignorance and happiness when I was taught that quantum mechanics was about nice discrete values of energies. Now I am introduced the idea...

Asked on 08/11/2020 by eliu

1 answer

Magnification in Holographic Microscopy

The book "Introduction to Optics" by Frank, Leno, and Leno Pedrotti, Ed 3, makes the claim that It can be shown that if the reconstructing light of wavelength $lambda_r$ is...

Asked on 08/10/2020 by Ulad Kasach

1 answer

Which electron moves first if you connected a wire to both ends of a battery at the exact same time?

Question 1: Which electron in the circuit moves first if you were to connect a wire to both ends of a battery simultaneously? Is it:The last electron in the wire,...

Asked on 08/10/2020 by ProGrammar

1 answer

Interpretation of horizon in de Sitter

Given the de Sitter metric for spacetime$$ds^2 = left( 1 - frac{Lambda}{3}r^2right) dt^2 - frac{1}{left( 1 - frac{Lambda}{3}r^2 right)}dr^2 - r^2dOmega^2 $$we understand this is a solution...

Asked on 08/10/2020 by ohneVal

1 answer

Why is the ideal gas law only valid for hydrogen?

I got this question in school:Explain, based on the properties of an ideal gas, why the ideal gas law only gives good results for hydrogen.We know that the ideal gas...

Asked on 08/09/2020

3 answer

Vapour pressure at the steady state

I came across a question today about vapour pressure, it was as follows : $2$ flasks $X$ and $Y$, each containing liquid water, joined by a tube...

Asked on 08/09/2020 by K. Chopra

2 answer

Free fall vs falling on incline of rotating bodies

When you have a sphere and a hoop on an incline, the sphere will always roll down faster because of the smaller moment of inertia. And this is the case...

Asked on 08/09/2020

2 answer

Why the emitted photon has exactly the same energy,phase and direction as the incident photon in stimulated emission?

My textbook says:-When an atom emits a photon due to its interaction with a photon incident on it,the process is called stimulated emission.the emitted photon has exactly the same energy,phase...

Asked on 08/09/2020 by Gaurav

2 answer

Why is the entropy of the universe so much lower than the Bekenstein-Hawking boundary entropy of the cosmic event horizon?

Currently, the most upvoted answer to the question What is the entropy of the universe today? cites a 2010 paper by Egan and Lineweaver, which estimated...

Asked on 08/09/2020 by Thorondor

0 answer

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