A siren emitting a sound of frequency 1000 H_(Z) moves away from you towards a cliff at a speed of 10 m//s . (a) What is the frequency of the sound you hear coming directly from the sirven ? (b) What is the frequency of sounds you hear reflected off the cliffb ? (c) What beat frequency would you hear ? Take the speed of sound in air as 330 m//s .
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Explanation:
According to the data given:
(a) Frequency of sound reaching directly to us (by S)
f1 = ( V/ v+ Vs)
f = (330/ 330+10) x 1000
= 970.6 Hz
Frequency of sound which is reflected from the cliff
f2 = (v/ V- V2) f = (300/ 330 - 10 )1000
= 1031. 3 Hz
Beat frequency = f2- f1
= 60.7 Hz
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