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Physics : Recent Questions and Answers (Page 585)

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

Why does particle measurement cause quantum wavefunctions to collapse

When we attempt to measure a certain property of a particle, how and why does its wave function collapse? I've tried to find answers on my own, but they've been...

Asked on 02/07/2021 by raegir

3 answer

Why is the electron self-energy gauge dependent?

Let $psi(x)$ be the field of the electron. Its Fourier transformed two-point function reads$$langlepsibarpsirangle=frac{1}{not p-m-Sigma(not p)}.$$ If we calculate $Sigma(not p)$, we observe that it depends on...

Asked on 02/07/2021

3 answer

Physical explanation of the non-analyticities in the ising model in the vicinity of zero external field

In the Ising model when $T<T_C$ with $T_C$ being the Curie temperature, there is a finite jump of the mean magnetization per spin, $m$, as the external...

Asked on 02/07/2021 by JKalle

0 answer

What exactly is voltage in this case?

My textbook states the following:Voltage is the same across each component of the parallel circuit.However I am confused on what the exact meaning of voltage is in this...

Asked on 02/07/2021

1 answer

Proper time, geodesic and external force

Deriving the geodesic equation $$ (nabla_u u)^mu = 0 $$ one uses the variation of proper time $tau[C]$ along $C$ $$ delta int_C dtau = int_C...

Asked on 02/07/2021

0 answer

Will it ever be possible to take a photo inside a nucleus, at the level of quarks?

If technology allowed it one day, would it be possible to physically photograph how quarks are arranged inside a nucleus?What would you see? For example, would it be possible...

Asked on 02/07/2021

3 answer

Christoffel Symbols Different Representation?

I was given the $mathbb{R^2}$ metric in polar coordinates, as follows: $$ds^2=dr^2+r^2dtheta^2$$ In this context we denote $e_1=partial_r=(cos(theta), sin(theta))$, $e_2=partial_{theta}=(-rsin(theta), rcos(theta))$. Also, here we...

Asked on 02/07/2021

0 answer

A Hidden Principle in Relativity

Thought experiments are very common in Special and General Relativity (SR,GR). Usually a thought experiment is structured as follows:We present a setup in a frame of referenceWe apply principles of...

Asked on 02/07/2021

6 answer

What's wrong about Maxwell's equations for a Hall probe?

I am using Maxwell's equation to analyse the current and electric field of a Hall Probe. A Hall probe is basically a thin sheet of metal with a current through...

Asked on 02/07/2021

2 answer

Why do we neglect torque caused by tension of curved part of rope in massive pulleys?

In this MIT OCW lecture, the professor analyzes a block - massive pulley - block system as shown here: ...

Asked on 02/07/2021

2 answer

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