A source of sound waves of frequency 0.7kHz is traveling through the air at 0.45

Question

A source of sound waves of frequency 0.7kHz is traveling through the air at 0.45times the speed of sound. (a) What is the frequency of the sound receivedby a stationary observer if the source moves toward her?
1 kHz

(b) Now, the source moves away from the stationary observer. Whatis the frequency of the sound received in this case?
2 kHz (a) What is the frequency of the sound receivedby a stationary observer if the source moves toward her?
1 kHz

(b) Now, the source moves away from the stationary observer. Whatis the frequency of the sound received in this case?
2 kHz

Explanation / Answer

(a) What is the frequency of the sound receivedby a stationary observer if the source moves toward her?
kHz
APPARENT FREQUENCY=(v-vo)n/(v-vs)=(v-0)1.2/v-0.25v=1.6kHz

(b) Now, the source moves away from the stationary observer. Whatis the frequency of the sound received in this case?
kHz
APPARENTFREQUENCY=(v-vo)n/(v+vs)=(v-0)1.2/v+0.25v=0.96kHz

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