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HNQ
2:35 AM
3
Q: Why don't humans perceive waves as twice the frequency they are?

Mondo DukeI was looking at how beats work. You use a amplitude wave $A = \cos\left(2\pi f_1x\right) + \cos\left(2\pi f_2x\right) = 2\cos\left(\frac{2\pi x\left(f_1-f_2\right)}{2}\right)\cos\left(\frac{2\pi x\left(f_1+f_2\right)}{2}\right)$ (frequencies $f_1$ and $f_2$). According to Wikipedia, "Because t...

 
 
13 hours later…
HNQ
3:59 PM
3
Q: Why doesn't Venus have a magnetic field? How does the speed of rotation affect the magnetic field of a planet?

joginder goswamiWhy doesn't Venus have a magnetic field? How does the speed of rotation affect the magnetic field of a planet?

 
 
3 hours later…
HNQ
7:20 PM
2
Q: Queuing by the event horizon

Mikael JensenI understand that an observer outside the event horizon (EH) of a black hole (BH) will not see anything disappearing from outside the EH - only the effects of the time dilution near the EH. Assume that a large number of objects are on its way towards the EH and the last objects can observe all ...

 

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