contestada

An aircraft is moving away from you at half the speed of sound, which, on that day is about 340 m/s.

The jet engines make a sound that is primarily about 300 Hz. What is the apparent frequency of the jet

engines?

(A) 150 Hz

(B) 200 Hz

(C) 470 Hz

(D) 600 Hz

Respuesta :

mavila18

Answer:

(B) 200 Hz

Explanation:

To find the apparent frequency you use the Doppler effect for a receding source:

[tex]f'=f(\frac{v}{v+v_s})[/tex]

f: frequency of the source = 300Hz

v: speed of souns = 340m/s

v_s: speed of the source = v/2 = 170m/s

you replace the values of the parameters and obtain:

[tex]f'=(300Hz)(\frac{340m/s}{340m/s+170m/s})=200Hz[/tex]

hence, the apparent frequency is 200Hz

(B) 200 Hz

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