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Physics : Recent Questions and Answers (Page 241)

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

Collision and shattering

If a light body moving at some speed $v$, collides with a heavy body at rest and shatters on impact, then what type of collision is this? Since the...

Asked on 06/23/2021 by Raghavendra Singh

1 answer

Why is Google's quantum supremacy experiment impressive?

In the Nature paper published by Google, they say,To demonstrate quantum supremacy, we compare our quantum processor against state-of-the-art classical computers in the task of sampling the output...

Asked on 06/23/2021

5 answer

Galileo Thermometers

Is it possible to create a Galileo thermometer by hand with house hold items? What are the physics and mathematics behind the Galileo thermometer and how can I...

Asked on 06/23/2021 by jdoe

1 answer

$O(N)$ symmetry in three dimensions

Recently, In a research article on magnetism, I came across the term"$O(N)$ symmetry for three dimensions with the limit $N->infinity$".What does it mean? When I tried to search...

Asked on 06/23/2021

2 answer

Extracellular potential via a point source

You can stimulate neurons extracellularly - that is, you place an electrode at a certain distance. Assuming a punctiform electrode and a homogeneous medium, the extracellular potential (in mV) reduces...

Asked on 06/23/2021 by Voeslauer123

1 answer

Why alkali metal vapours are widely used in laser spectroscopy?

I've read, that because they are readily ionized and strongly interacting with the laser light, they could be used to study interconversion mechanisms between photon, chemical, thermal etc. energy. Why...

Asked on 06/23/2021 by Gianni D'Adova

1 answer

Finding the Expectation value for a wave function

I have a question about finding the expectation value. Here's the question: So I have this wave function $$|?⟩=frac{sqrt{6}}{?}sum_{n=1}^∞ C_?|n⟩ $$ where the eigenvectors |n⟩ form an orthonormal basis...

Asked on 06/23/2021 by user289904

3 answer

Proof Rényi entropy is non negative

The Rényi entropy is defined as:begin{equation}S_alpha = dfrac{1}{1-alpha}log(text{Tr}(rho^alpha))end{equation}for $alpha geq 0$. This can be rewrited in terms of $rho$ eigenvalues, $rho_k$, which...

Asked on 06/23/2021

1 answer

Do quark charges repel one another?

Positive electrical charges repel other positive charges, and negatives repel negatives. But does that happen for quarks, too? I never saw mention of it, but if so, that would mean...

Asked on 06/23/2021

4 answer

Amplitude for neutron-proton conversion from first principles

I'm reading Dodelson's Modern Cosmology, and in one of the exercises on Big Bang nucleosynthesis it is quoted without reference that the amplitude for neutron-to-proton conversion is given by ...

Asked on 06/23/2021

1 answer

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