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A police siren emits a sinusoidal wave with frequency fS=390Hz . On this cool day, the speed of sound is 340 m/s . What frequency will a stationary listener hear when the police car is moving away at 30.0 m/s ?

30.0 m/s

Part A - Practice Problem:

What frequency does the police officer hear?

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Answer #1

The police officer will hear with frequency

fL = fs * [v - vL / v + vs]

= 390 * [340 - 30 / 340]

frequency = 356 Hz

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