Tagged Questions
5
votes
1answer
210 views
Meaning of negative frequency of sound wave
Suppose that Alice and Bob are both holding speakers emitting sound at a frequency $f$. Alice is stationary while Bob is moving towards Alice at twice the speed of sound.
In the case of Alice, if I ...
4
votes
1answer
165 views
speed of sound and the potential energy of an ideal gas; Goldstein derivation
I am looking the derivation of the speed of sound in Goldstein's Classical Mechanics (sec. 11-3, pp. 356-358, 1st ed). In order to write down the Lagrangian, he needs the kinetic and potential ...
0
votes
0answers
131 views
Sound waves. Relating the displacement to the pressure function
I am trying to understand some notes my professor has typed up. He writes that we can write a sound wave in terms of the variation of pressure in a medium over time using the function
$$ p(x, t) = P_0 ...
3
votes
1answer
764 views
Is it possible to break bulletproof glass with your voice?
In The Adventures of Tintin, an opera singer (the Milanese Nightingale) broke a bulletproof glass case using her voice. Is that scientifically possible?
From the Wikipedia page, a typical bulletproof ...
