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Physics : Recent Questions and Answers (Page 813)

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

Is it resistance of filament or current thorugh it which determines brightness of bulb?

SO brightness of bulb. Does it depend on the resistance or current in it?I have two bulbs keeping everything same except resistance. So Bulb A - high resistance Bulb...

Asked on 10/15/2020

2 answer

Does the absorbtion of photons from the Sun decrease with distance for a point charge?

Let's suppose we have a point charge with no dimensions (zero volume and surface area) absorbing photons from Sun. Does it change the amount of photons and energy absorbed when...

Asked on 10/15/2020

4 answer

Why aren't black holes the same as M2 branes?

If there was an M2-brane with the topology of a sphere. Then I can't see why there are not the same thing? They both have the same topology if we...

Asked on 10/15/2020

1 answer

What is the difference between a macrostate and multiplicity?

The entropy of a system of an ideal gas depends on the external parameters $U, V, N$. I always thought entropy is defined by a certain macrostate, which is...

Asked on 10/15/2020 by racctor

3 answer

Magnetism in bipartite lattices

Suppose we have a bipartite lattice( A and B).By tuning some parameters in the Hamiltonian, we get a region of parameter space where sublattice magnetizations, $m_{A}$ and ...

Asked on 10/14/2020 by Annie

1 answer

What is it about the mechanism for the strong force which creates a force?

So as I understand it, the mechanism for the strong force is that quarks emit/exchange gluons. Similarly, quark-anti-quark pairs are what pass between nucleons in an atom causing them to...

Asked on 10/14/2020

0 answer

Black hole's time effect and matter (or energy) position

Ok, so after I've read a few (around 50 :P ) articles on subject of black holes. There are a few gaps in my understanding of it. Please follow my...

Asked on 10/14/2020 by Coco

1 answer

What are the advantages of using the concept of a lever arm when working with torques?

I tutor some high school students, mostly in math but occasionally in Physics as well; I love the science but only took it through the high school level plus a...

Asked on 10/14/2020

0 answer

Deriving the non-paraxial form of Rayleigh criterion

Background The Rayleigh criterion of imaging resolution says that two incoherent point sources are barely resolved by a diffraction-limited system with a circular aperture where the center of the Airy...

Asked on 10/14/2020

1 answer

Question about choice of objects when calculating potential energy

The formula for change in potential energy of a system made up of object A and B is: change in potential energy of system = - (dot product of [conservative...

Asked on 10/14/2020 by Pranav Jain

1 answer

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