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Plaetean
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Homework Statement
Consider a sinusoidal pressure wave in a gas with a fixed displacement amplitude of 1cm. The gas has a density of 2 kg m-3 and the wave travels at a velocity of 10 m s-1.
a) What is the bulk modulus of the gas? [3]
b) What is the wavelength of the wave if its temporal frequency is 1 kHz? [2]
c) By what factor must the frequency of the wave be increased for it to become sub-supersonic?
Homework Equations
v=fl=[itex]\sqrt{B/ρ}[/itex]
The Attempt at a Solution
a) and b) I can answer fine, but I have no idea what c) is even asking. I have a solution sheet, and the solution is given here, but I can't follow it at all I'm afraid.