When a car is moving towards an observer, the frequency of the sound heard by the observer is higher than the frequency produced by the source due to the Doppler effect. However, after the car passes by the observer, the frequency decreases, resulting in a lower pitch than the original frequency.
In this case, the car's horn produces a frequency of 350 Hz. After the car passes Suzy, she will hear a lower frequency due to the Doppler effect. The frequency she hears will not be as low as half the original frequency (which would be 175 Hz), and it will likely be close to, but lower than, 350 Hz.
Given the choices:
- 330 Hz
- 350 Hz
- 360 Hz
- 700 Hz
The best estimate for the frequency Suzy hears after the car passes her would be 330 Hz, as it is the only option that represents a lower frequency compared to the original 350 Hz.
So the answer is 330 Hz.
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