Two cars A and B are moving away from each other in opposite direction – McqOptions

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1.	Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of 20 ms-1 with respect to the ground. If an observer in car A detects a frequency 2000 Hz of the sound coming from car B, what is the natural frequency of the sound source in car B?(Speed of sound in air = 340 ms-1)
A.	2250 Hz
B.	2060 Hz
C.	2300 Hz
D.	2150 Hz
Answer» B. 2060 Hz

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