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Physics : Recent Questions and Answers (Page 777)

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

Which one is better to boil water, using high heat or less heat?

Consider that I have a water boiling kettle as below. Assume that it is made of metal, not plastic (but plastic probably also will do). Assuming I can adjust the...

Asked on 12/01/2020 by AirCraft Lover

2 answer

Does matter redshift light via gravity?

Imagine a photon passes by a stationary atom in a large void of empty space. We know that the gravity of the atom will bend the path of the...

Asked on 12/01/2020 by Derek Seabrooke

1 answer

Free body diagram (FBD) of a beaker having water and a block

Suppose there is a wooden block in a liquid in beaker.So there would be MG, buoyant force downwards, and normal contact force due to water also right? Would that...

Asked on 12/01/2020 by Sachin Chaudhary

1 answer

What dependence does reversibility have on the time taken to change state of a system?

In this video lecture , at 39:37, The professor describes that if we do the process slowly then the system moves through a set of equilibrium states...

Asked on 12/01/2020

3 answer

Unique properties of Hamiltonian

Given a general (time-independent) system where I have some Hermitian operator $O$, is there a way of knowing if $O$ happens to be the Hamiltonian? In other words,...

Asked on 12/01/2020 by jfeis

1 answer

Discrepancy in two-point correlator integral of Harmonic Oscillator

The two point correlator of Quantum H.O. of natural frequency $omega$, calculated using path integrals, is$$C_{2}=Dleft(t_{2}-t_{1}right) propto int frac{d w^{prime}}{2 pi} frac{e^{-i w^{prime}left(t_{2}-t_{1}right)}}{w^{prime2}-w^{2}}tag{1}$$ which evaluated using contour...

Asked on 12/01/2020 by aneet kumar

0 answer

Why hasn't the false vacuum collapsed yet?

The Standard Model, and current measurements of the Higgs mass, suggest that our universe is in a metastable state, which may catastrophically collapse into a false vacuum. ...

Asked on 12/01/2020 by Jake Zhou

2 answer

What is the relation between the short-circuit current and the band gap energy in solar cells?

For the VOC it is: VOC = E_g - something, where something is positive and depends on the Urbach energy. Otherwise it should be linear:https://aip.scitation.org/doi/pdf/10.1063/1.49397 For...

Asked on 12/01/2020

1 answer

Infinite charged sheet kicked into motion - Electric field direction?

In volume two of the Feynman Lectures on Physics, Chapter 18, here: http://www.feynmanlectures.caltech.edu/II_18.html There is a scenario in which an infinitely extending charged sheet is suddenly kicked...

Asked on 12/01/2020 by user154080

1 answer

What is the intuitution behind a wave with zero wavenumber?

I was recently solving a physics problem that gave you the electric field $$E(x, y, z, t) = E_{0}cos(k_{y}y + psi_{y})sin(k_{x}x-{omega}t)hat{z}$$ and the question asked for a variety of...

Asked on 12/01/2020 by levente.nas

1 answer

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