Question

Two cars approaching each other , first car moves at 72 km/h ,the second car moves at 90 km/h,the first car started its siren with a frequency of 650 Hz. If the speed of the sound is 350 m/s, then what is the frequency of the sound heard by the driver of the second car from the police car?

Answer 1

Because the speed of sound travels at +- 1300 km/h and the car that is approaching isn't that fast. So u first hear the sound before the car reaches u.

i hope it helps

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