A siren mounted on the roof of a firehouse emits sound at afrequency of 900Hz. A

Question

A siren mounted on the roof of a firehouse emits sound at afrequency of 900Hz. A steady wind is blowing with a speed of15.0m/s. Taking the speed of sound in calm air to be 343m/s, Findthe wavelength of the sound

a) upwind of siren
b) downwind of siren

Firefighters are approaching the siren from different directions at15.0m/s. What frequency does a firefighter hear

c) if she is approaching upwind position so that she is moving inthe direction in which the wind is blowing and

d) if she is approaching from a downwind position and movingagainst the wind?

Explanation / Answer

Yes the -15 and the +15 should be switched around for a andb. Good catch.

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