Question
Asked Apr 25, 2019
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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the
frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer
in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361
b. 636
С. 393
d. 396
e. 383
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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.) a. 361 b. 636 С. 393 d. 396 e. 383

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Expert Answer

Step 1

The speed of the truck is 36 m/s, the speed of the police car is 45 m/s, the frequency of the siren with respect to the police car is 500 Hz and the speed of the sound is 343 m/s. The truck and the car moves in the opposite direction.

Step 2

Doppler effect is the apparent change in frequency due to the relative motion of the observer.

Let f' be the observed frequency, v  be the actual speed of sound, v0 be the velocity of the police car, vs be the velocit...

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