The best estimate of the frequency Suzy hears after the car passes her is govern by doppler effect and it is 330 Hz.
Frequency is the number of occurrences of a repeating event per unit of time.
The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
According to the Doppler Effect, the frequency observed by an observer decreases for source going away.
To know more about Doppler Effect here
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