A siren emitting a sound of frequency 1000 Hertz moves away from you towards the face of a cliff at a speed of 10 m/s. Take the speed of sound in air to be 330 m/s.
a. Compute the frequency of the sound you hear directly from the siren?
b. Compute the frequency of the sound you hear rejected off the cliff?
c. Compute the beat frequency between the two sounds?