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Q.

Two cars having velocities of 100 and 150 kPh are approaching each other. The frequency of a note emitted by the first as heard by its driver of the other is 1000 Hz. Speed of sound is 330 m/s. The two frequency of sound is

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a

500 Hz

b

750.6 Hz

c

844.7 Hz

d

900 Hz.

answer is C.

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Detailed Solution

n = v - vsv - vo = 330 - 100036330 + 150036×1000 = 844.7 Hz
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