A sound of constant frequency is produced by the siren on top of a firehouse. Compared to the frequency produced by the siren, the frequency heard by the fire fighter approaching the fire house is what?

Question

A sound of constant frequency is produced by the siren on top of a firehouse.  Compared to the frequency produced by the siren, the frequency heard by the fire fighter approaching the fire house is what?

oobleck · Answer

you might try googling doppler effect