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Physics : Recent Questions and Answers (Page 282)

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

Demonstration of Electromagnetic Tensor antisymmetry

I've already made a post about this topic here, but I realized that I didn't understand the explanation on that post. in Chapter 7 of Rindler's book on relativity, in...

Asked on 06/05/2021 by Lil'Gravity

2 answer

At what height does water need to fall to produce negative ions?

Research shows that waterfalls and apparently showers produce negative ions, is there a certain height or velocity for water to fall to produce negative ions?...

Asked on 06/05/2021

0 answer

What is the speed of sound in space?

Given that space is not a perfect vacuum, what is the speed of sound therein? Google was not very helpful in this regard, as the only answer I found was...

Asked on 06/05/2021 by Josh Glover

7 answer

Explanation for strange pattern appear on Bath tub with sand in it

We have a round bathtub with a surface radius of about 15 cm or greater. It so happens that the water that came from the tab has a little sand...

Asked on 06/05/2021

0 answer

Need 50Hz detection antenna for reception of AC mains signal

Anyone know how can i design antenna for electric field detection. i m trying to make contactless Ac mains Detector which range is near about 1-mtr long.my question is...

Asked on 06/05/2021 by Er.rht

1 answer

Doubt regarding intensity received at a point

I came across a problem which is as follows: Screen S is illuminated by two point sources A and B. Another source C sends a parallel beam of light towards...

Asked on 06/05/2021

0 answer

Potential at the surface of a conducting sphere near a dipole

An ideal conducting solid sphere of radius $R$ and center $O$ is brought near a dipole with a dipole moment of magnitude $p$. Let the center of...

Asked on 06/05/2021 by Abhinandan

3 answer

Parity conservation in electromagnetic decays

When a $pi^0$ decays into photons, the only possible number of photons to which it can decay is $2times n$, with $n$ a natural number. This is...

Asked on 06/05/2021

1 answer

What does it mean that a Lagrange multiplier is zero?

If I have the following Lagrangian $$L'=frac{1}{2}dot{x}^2+frac{1}{2}dot{y}^2$$ I can impose the constraint $x-y-C=0$ via a Lagrange multiplier $lambda$, so the new Lagrangian is $$L=frac{1}{2}dot{x}^2+frac{1}{2}dot{y}^2+lambda(x-y-C),$$ whose Euler-Lagrange...

Asked on 06/05/2021

3 answer

Origin of the de Broglie Equation

I was curious about the famous $p=hbar k$ equation. In high school I think you are just exposed to this equation with the explanation of "something something matter waves."...

Asked on 06/05/2021

2 answer

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