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Physics : Recent Questions and Answers (Page 314)

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

How do we mathematically justify the straight line approximation of the calculation of Shapiro time delay?

While reading GR, I came about the tests of GR, one of them being Shapiro Time delay. The idea being that it takes more time to travel...

Asked on 05/23/2021

0 answer

Question on the creation of an entangled photon pair in a specific realization of the EPR-Bohm Experiment

In a student experiment the following assembly is used to create an entangled photon pair. From the left, a laser...

Asked on 05/23/2021 by Larss96

1 answer

How do Sources Affect the Linearity of a Circuit

How do voltage/current sources - both dependent and independent - affect the linearity of a circuit? To apply the superposition theorem, a circuit must be linear. As I understand it,...

Asked on 05/23/2021 by Fascheue

0 answer

Second quantization and bosons in Tomonaga's "The story of spin"

TL; DR: According to a book by Tomonaga in a chapter introducing second quantization, the formula$$e^{pm i Theta/hbar} ,psi(N) = psi(Npm 1)$$is supposed to prove that the...

Asked on 05/23/2021 by JackI

1 answer

How did Einstein know where to put individual elements of E-M Tensor $T$ w.r.t. the corresponding tensor $G$? where $G=kappa T$

We know the well known relation in General Relativity. $G=kappa T$ Where G is the Einstein Tensor and T is the Energy-Momentum Tensor and K is the constant. I...

Asked on 05/23/2021 by The_Theoretical_Physicist

1 answer

Lorentz Transformations for Polar coordinates or Inertial Frame in Polar Coordinates

Do polar coordinates define an inertial frame or not? Everywhere in GR, the authors of all the books talk about bring the metric to diag(-1, 1,1,1) which would show that...

Asked on 05/23/2021

2 answer

Why energy levels of each atoms split in band theory of solid such that they are not degenerate?

I recently came across energy band theory in semiconductors and pauli's exclusion principle. But I'm not sure how energy level split and why, when the atoms are so much far...

Asked on 05/23/2021 by Nazmul Hasan Shipon

0 answer

Wedge flow boundary layer

Why does the velocity of free stream outside the boundary layer in wedge flow changes in direction of flow ($x$)? Why thickness of boundary layer on the wedge is...

Asked on 05/23/2021

1 answer

How can an engine provide more torque at the point of contact than the ground's response by static friction without slipping?

In response to the top answer here: Newtonian Mechanics - How does something like a car wheel roll? I clearly fundamentally misunderstand something here. I can't reconcile there being...

Asked on 05/23/2021

3 answer

How do cosmologists measure cosmological distances and the expansion history of the universe?

Cosmologists from the BOSS and eBoss surveys construct 3-D maps of correlated galaxy positions, measure their redshifts and use the comoving BAO feature as a standard ruler. With these data,...

Asked on 05/23/2021

0 answer

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