Why does a police car siren change pitch when it passes us?
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As the police car approaches us, The pitch increases, and when it moves away from us, the pitch decreases. When the car approaches us, the sound wave of the Siren are Compressed more towards us, resulting in higher pitch. When the car is moving away, the sound wave get stretched, as a result sound fades away. This effect can be noticed only by an outside observer, the driver hears the same pitch of sound all the times. This phenomenon is called the Doppler effect.
⬛️Here is the answer, you needed..
As the police car approaches us, The pitch increases, and when it moves away from us, the pitch decreases. When the car approaches us, the sound wave of the Siren are Compressed more towards us, resulting in higher pitch. When the car is moving away, the sound wave get stretched, as a result sound fades away. This effect can be noticed only by an outside observer, the driver hears the same pitch of sound all the times. This phenomenon is called the Doppler effect.
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Answer:
The pitch we hear depends on the frequency of the sound wave. A high frequency corresponds to a high pitch. So while the siren produces waves of constant frequency, as it approaches us the observed frequency increases and our ear hears a higher pitch
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