A physics student holds a tuning fork vibrating at 440 Hz and walks at 1.2 m/s away from a wall. Does the echo from the wall have a higher or lower pitch than the tuning fork? What beat frequency does he hear between the fork and the echo? The speed of sound is 330 m/s.
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As the tuning fork, which emits sound of frequency 
, moves away from the wall at speed v, the sound that is incident on the wall has frequency
Then the student, who is moving away from the wall at speed v, hears the reflected frequency
The echo has a lower frequency. The beat frequency between the fork and the echo is
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