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Physics : Recent Questions and Answers (Page 219)

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

Where can I find a table for NIST standards on temperature and pressure?

The Wikipedia article Standard conditions for temperature and pressure notes that IUPAC and NIST are two of the most common standards for temperature and pressure in use....

Asked on 07/02/2021

4 answer

Can a black hole absorb linear momentum?

I know that black holes maintain the linear momentum of the object that created it. But if I throw a baseball into a black hole, will it absorb that momentum...

Asked on 07/01/2021 by Marc DiNino

1 answer

Why do reactions involving oxygen need initial heating?

Why do we need to supply heat before reacting any chemical substances with oxygen?...

Asked on 07/01/2021 by Neutral Me

2 answer

Unanswered Question on Potential Step Function

I have looked at the questions on this stack exchange and did not find a single convincing answer. Please absolutely remember the mathematical definition of only 4 things as you...

Asked on 07/01/2021 by Captain HD

1 answer

Keldysh formalism and Kubo formula

I am working on out-of-equilibrium problems of strongly correlated materials, so I am interested in the Keldysh formalism. I just started reading about the subject, and I...

Asked on 07/01/2021 by lakehal

2 answer

Rigid Body Motion and defining $vec{L}$ and $vec{omega}$

This is a study question I have been struggling with, I would appreciate help defining initial vectors to start the question. We consider a thin circle shaped disk (mass m,...

Asked on 07/01/2021 by benmcgloin

2 answer

Ways to analyze the differences between experimental and theoretical data

I have around 5000 data points of theoretically computed and experimentally measured (via FTIR) K2 line positions(v (v", J''; v', J'). I divided the data into wn segments ( along...

Asked on 07/01/2021

0 answer

The Fourier Transform and Fraunhofer Diffraction

I'm currently learning about Fraunhofer diffraction and I don't really understand how it works with the fourier transform and the tophat function. I'm currently struggling on a question involving two...

Asked on 07/01/2021

0 answer

Am I understanding the equivalence principle correctly?

So Einstein stated that gravity and acceleration are the same things in a local reference frame (please correct me if I misstated that). Here is what I think I understand...

Asked on 07/01/2021

4 answer

How to interpret an inner product between two non-degenerate eigenstates of time-dependent Hamiltonian?

There are three questions I would like to ask:This finally enables us to rewrite $(5.6.8)$ as$$dot{c}_{m}(t)=-c_{m}(t)langle m ; t|left[frac{partial}{partial t}|m ; trangleright]-sum_{n} c_{n}(t) e^{ileft(theta_{n}-theta_{m}right)} frac{langle m;...

Asked on 07/01/2021

0 answer

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