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Moderate

Frequency of Source

APPH12-OZIOL1

A stationary observer is listening to the note produced by a departing sound source.

If the observer detects a sound of frequency 800Hz, what is the value of the frequency $f$ being produced by the source?

A

$f$ < 800 Hz

B

$f$ = 800 Hz

C

$f$ > 800 Hz

D

The speed of the sound source is necessary to answer this question.