Answer to Question #88454 in Molecular Physics | Thermodynamics for gc

Question #88454
A
180-Hz
sound travels through pure helium. The wavelength of the sound is measured to be
5.59 m.
What is the speed of sound in helium?
1
Expert's answer
2019-04-29T09:23:20-0400

If we know the frequency of the sound wave, f, as well as its wavelength, λ, then the speed of sound, Vs , is determined by

Vs=fλ{{V}_{s}}=f\cdot \lambda

Substituting the given values f=180 Hz and λ=5.59 m, we get the speed of sound in helium

Vs=180 Hz5.59 m=1006.2m/s{{V}_{s}}=180\text{ Hz}\cdot 5.59\text{ m=1006}\text{.2}\,\text{m/s}

Answer: the speed of sound in helium is 1006.2 m/s.


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