A source of sound waves of frequency 1.2kHz is traveling through the air at 0.25

Question

A source of sound waves of frequency 1.2kHz is traveling through the air at 0.25times the speed of sound. (a) What is the frequency of the sound receivedby a stationary observer if the source moves toward her?
kHz

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

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