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Physics : Recent Questions and Answers (Page 218)

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

Velocity of Solar System relative to CMB

In the book 'An introduction to science of cosmology' by Raine and Thomas, they have two equations$$frac{Delta T}{T} = frac{v}{c}costheta'qquad (4.14)$$$$T = (3.372±0.014)×10^{-3}costheta' K qquad...

Asked on 07/02/2021 by user89083

2 answer

Do I correctly understand the reason why the Hall resistivity in Quantum Hall Effect becomes larger as magnetic field increases?

I'm wondering whether I correctly understand the increase of the Hall resistivity rho_xy in Quantum Hall effect. As you can see the graph, ...

Asked on 07/02/2021 by phys_gur

0 answer

Why is torque not measured in Joules?

Recently, I was doing my homework and I found out that Torque can be calculated using $tau = rF$.This means the units of torque are Newton meters. Work...

Asked on 07/02/2021 by General Stubbs

10 answer

Can we achieve coherence/high directivity by polarisation?

I can understand little bit what coherence means and little bit what is polarisation means. The question is there a way to achieve coherence by polarisation? Specifically consider a source...

Asked on 07/02/2021 by Creator

0 answer

Heat dissipation in space - how do they do that?

Consider a space aircraft. During its propulsion, I believe a lot of heat is transmitted to the aircraft by simple contact with the motor. But in space, there is no...

Asked on 07/02/2021

0 answer

How to study motion?

I am a high school student and recently learned about linear, circular and oscillation motion. I also read that Newton laws of motion fails at quantum level. Now, I am...

Asked on 07/02/2021

1 answer

Regarding the radial motion of photons

Photons move on null geodesics and the equation of motion on equatorial plane after some algebra can be written as $$e^{nu}dot{t}^2-e^{-nu}dot{r}^2-r^2dot{phi}^2 = 0$$ $phi =0$ for the...

Asked on 07/02/2021

2 answer

How Do I Determine These Variables? (See equation below)

How do I determine variables g (reciprocal lattice vector for diamond) and Omega (Unit Vector in the direction of X-ray emission) ? ...

Asked on 07/02/2021 by Zeno Chen

0 answer

Why do we use the word 'current' when discussing the weak force?

So, for example, my notes go through fermi theory, in which case the interactions are:$$G_F j^dagger_mu j^mu$$where$$j_mu = barνγ_µe + bar pγ_µn...

Asked on 07/02/2021

0 answer

What does it mean to have a VEV greater than zero?

What is the physical meaning of saying that a VEV is greater than zero? Are we saying that the energy of the ground state is greater than zero, that is...

Asked on 07/02/2021

0 answer

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