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A police car siren emits a frequency of
2010 Hz when stationary. Another car
hears a 1920 Hz sound when it drives
away from the stationary police car.
How fast is the second car driving?
(Speed of sound = 343 m/s)
(Unit = m/s)

Respuesta :

ashish4112119

Answer:

7.85 m/s

Explanation:

simplify 2010/1920

divide both top and bottom by 30

67/64

64V+64Vs=67V-67Vs

3V=131Vs

Vs=3V/(131)

V=343

Vs=3*343)/(131)= 1029/131= 7.85 m/s

Speed of second car  will be 15.35 m/s

What is Doppler effect ?

The Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.

f0= observed frequency = 1920 Hz

v = speed of source = 343 m/s

v0 = speed of observer = ?

fs = frequency of source = 2010 Hz

from Doppler effect

f0 = (v -v0 / v) * fs

1920 / 2010 = (343 - v0)/ 343

(192/ 201) * 343 = 343 - v0

v0 = (343 * 9) / 201 = 15.35 m/s

Speed of second car  will be 15.35 m/s

learn more about Doppler effect

https://brainly.com/question/15318474?referrer=searchResults

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