A police car is parked by the side of a highway and its siren emits a sound measuring 750 Hz. As you approach the police car from a distance, you hear a change in the sound. The change is in the sound's

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Physics

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18 March, 08:50

A police car is parked by the side of a highway and its siren emits a sound measuring 750 Hz. As you approach the police car from a distance, you hear a change in the sound. The change is in the sound's

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Libby Cox · Answer 1

From my research, the "change in the sound" here is caused by the Doppler effect. The Doppler effect is experience when a source of a sound is being approached to and walked away from, or similarly, when a source of sound is approaching you then moving away from you. As a sound source (in this case, a police siren) is being approached to, the sound you here is a bit high in frequency, but as you walk away from the siren, the frequency drops.