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At an auto race, a member of the pit crew stands beside the track. A car approaches him at 100 m/s and emits a sound at frequency 1100Hz. The air is still and the speed of sound is 340mls. What frequency will the pit crew member hear? A.1560Hz
B.1420Hz
C.1640Hz
D.850Hz

Respuesta :

As per the formula of Doppler's effect we know that

[tex]f = f_o\frac{v}{v - v_s}[/tex]

now we know that

v = 340 m/s

[tex]v_s = 100 m/s[/tex]

[tex]f_o = 1100 Hz[/tex]

now we will have

[tex]f = 1100(\frac{340}{340 - 100})[/tex]

[tex]f = 1560 Hz[/tex]

so the frequency heard by the crew will be approx 1560 Hz

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