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Physics : Recent Questions and Answers (Page 233)

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

Generalizing a flat-spacetime-approach for time dilation to curved spacetimes

I would like to discuss an idea to generalize a flat-spacetime-approach for time dilation to arbitrary curved spacetimes. Starting Point Suppose we have - in flat spacetime - one inertial...

Asked on 06/26/2021

0 answer

Mean density from a density function $rho(r)$

Let's say I have some mass density function $rho(r)$ in a sphere of radius $R$. Question is how can a mean density of object be inferred from such...

Asked on 06/26/2021

1 answer

Peaks in Co-60 gamma spectrum

The following plot shows data collected from a Co-60 coincidence experiment. The detectors used were NaI(T) scintillation detectors. One detector was gated around the 1.33 MeV peak and the second detector...

Asked on 06/26/2021

1 answer

Mirror moving near the speed of light

Suppose I am looking at a moving mirror, the image will move at twice the speed of the mirror but what if the mirror was to move with half the...

Asked on 06/26/2021 by gunslinger

2 answer

Spin of photons and angular momentum of classical radiation field. Are they connected?

Photons, the quanta of the radiation field, carry spin $-$ an intrinsic angular momentum. Classical radiation also has angular momentum having the expression $$vec{J}=frac{1}{mu_0c^2}int dV left(vec{r}timesleft(vec{E}timesvec{B}right)right).$$ Is it...

Asked on 06/26/2021

2 answer

Violating Newtons First Law!

Suppose you are inside a very large empty box in deep space , floating ( i.e not touching the box from anywhere initially).The box is at complete rest.Now you...

Asked on 06/26/2021 by Bhavesh Sood

6 answer

What type of regulation is being employed?

As already mentioned in this post. In the context of QFT, the kernel of integration for the overlap of a field configuration ket, $| Phi rangle$ with the...

Asked on 06/26/2021

1 answer

A body is rotated in air and is dropped on the floor slowly

When a body is rotated with a constant angular velocity $omega$ and is dropped to ground, the friction should act as in the picture below...

Asked on 06/26/2021 by Get_RiGhT

2 answer

What does the output of the correlation look like in the typical experiments testing Bell inequalities when using light and polarizers?

I am curious to know what a plot of polarizer angle vs counts produces for experimental results of Bell tests vs the classical prediction....

Asked on 06/26/2021

2 answer

Can we speak of an absolute voltage without a convention?

In most practical cases I have seen, voltage was regarded as a difference in electric potential, save the odd change of magnetic flux over time which, as a form of...

Asked on 06/26/2021 by Carvo Loco

1 answer

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