Question

An ambulance travels east down a highway at a speed of 33.5 m/s, and its siren emits a sound frequency at a frequency of 400 Hz. What frequency is heard by a person in a car traveling west at 24.6 m/s:

a) as the car approaches the ambulance ?

b) as the car moves away from the ambulance ?

(Take the speed of sound to be 343 m/s)

PLEASE INCLUDE WRITTEN EXPLANATION

Answer 1

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VS Given, Ambulance, speed (V) = 33.5 m/s f frequency 24.6 hils 10 4.00 HZ velocity of Car (vo) = 24.6 / Here Ambulance act as a source and car as a obserrer, a when When car approch, the ambulance It vo VE Vo= tve f fs ( 13 ve. US + when observer toward source when observer away from source - ve source towards observer + source away from observes (145 14 vo 1- Us V 24.66 . f = fs f = yoo 475.09 Hz ④ wien car aivary from observes fa ifs: ( 25 1- 33.5 343 lavo + us V. 24:6 - 338:27 12 = 400 I + 393 33.5 343 CS Scanned with CamScanner