An ambulance siren emits a sound with a single frequency $f$.
The ambulance travels towards, passes close to, and then travels away from a stationary observer.
Which statement describes the frequency of the sound detected by the observer as the ambulance <strong>passes </strong>the observer?
equal to $f$ and decreasing
2 )
equal to $f$ and increasing
3 )
greater than $f$ and constant
4 )
less than $f$ and constant
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