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Physics : Recent Questions and Answers (Page 43)

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

How can a solid be thermally transparent?

Thermal cameras designed to image wavelengths between 7-14µm (which is the peak for blackbody radiation around "room" temperatures) use lenses made of germanium, zinc sulfide, zinc selenide, or various...

Asked on 10/05/2021

1 answer

Resistance in two identical wires of different densities

Here is a question >Two wires A and B of same material and mass have their lengths in the ratio $1:2$ .On connecting them to the same source ,...

Asked on 10/05/2021 by Jdeep

2 answer

$phi^4$-theory: interpreting the RG flow

I'm referring to these lectures on the Renormalization Group and more precisely the figure of the RG flow for the $phi^4$-theory on page 18. The Lagrangian in the...

Asked on 10/05/2021 by Anne O'Nyme

3 answer

Why can't $rm N_2$ TEA lasers produce optical breakdown? (sparks in the air)

I've been googling around and I can't find any direct explanation of why N2 TEA lasers are never shown to be used to demonstrate optical(dielectric?) breakdown or sparks in the...

Asked on 10/05/2021 by pixelsnpings

1 answer

How to find integral's bounds - calculating electric field using Gauss's law?

This is the original question:The space between two parallel infinite planes $ x=0 $ and $ x=L $ is filled with charge of the density $ rholeft(xright)=ax^{2}left(L-xright)...

Asked on 10/05/2021 by DirichletIsaPartyPooper

2 answer

Root Mean Square Displacement of Diffusion and Radial Diffusion Function

I read, that for normal diffusion the root mean square displacement $sqrt{langle x^2(t)rangle}$ (for particles at the origin) can be interpreted as the mean distance the particles have with...

Asked on 10/05/2021 by Roger.Bernstein

0 answer

Is the electron flow restricted by filament of a bulb?

Suppose that the electrons move with a speed of 0.0005 mm/sec in the copper wires. Do the electrons move with the same speed in the tungsten filament as well? This...

Asked on 10/05/2021

1 answer

What is the value of the variation stress energy tensor?

If we are living in a portion of space-time where the metric is very close to flat space and we know that the stress energy tensor is negligible at this...

Asked on 10/05/2021 by MrDi

1 answer

Does perfectly horizontal circular motion exist in this example?

The scenario I am putting forward is something like this: Can the string really be perfectly straight and horizontal as shown...

Asked on 10/05/2021

3 answer

Do we have good reasons to believe that neutrino oscillations aren't the result of a new particle? If so, what are they?

The standard way of describing neutrino oscillations seems to be that the mass eigenstates differ from the flavour eigenstates, which leads to an oscillation of neutrino flavour over time. However,...

Asked on 10/05/2021 by C. O'Neill

3 answer

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