# All Questions

132,899 questions
2 views

### Feeling sound; frequency and volume

How loud and "low" must a sound be in order for one to feel some physical sensation in response? I've read that below certain frequencies humans can be expected to "feel" sounds in their chests, and I ...
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### Charge of Universe

The charge of the universe is said to be zero. The most general argument I hear about this is that: since there was no net charge before the universe there must not be any after. Hence the universe is ...
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### How to determine exchange particle of two-to-two process?

For the process, $e^+e^- \rightarrow e^+e^-$ I know that the exchange particle is a photon and for the process $\gamma\gamma \rightarrow e^+e^-$, the exchange particle would be an electron but I'm not ...
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### How was Maxwell able to derive velocity distribution?

Did he assume that their velocities follow some kind of statistical distribution and fit the parameters accordingly. Or did he mathematically prove it?
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### European XFEL : TDS strutures

Can someone explain whats the difference between fill time, accelerator fill (Ta) time and cavity fill time(Tc)? Is fill time and acellerator fill time the same ?
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### Bond Nature of a comound

How can we determine the type of Bond in LiBaPO4? can we find out the nature of bond through charge transfer values of these elements? if yes then how?
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### How does thermal energy in a system do mechanical work?

Explain that a system with thermal energy has the capacity to do mechanical work. Also, in addition to this what are the differences between work and mechanical work?
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### How far can you pee on the moon vs. mars?

Let's suppose you are at Elon Musk's Future Mars colony and you drank too much beer, how far can you pee on Mars if you can pee one meter on earth? If the next day you get on the shuttle to the ...
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### Don't matter-antimatter annihilate each other completely releasing energy as photon?

Matter and antimatter should annihilate each other completely releasing energy in the form of photon, however it is discovered that smashing electron and positron together can also spew out higgs ...