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JEE Main 9 Apr 2019 Paper 2 Solved Paper

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Question : 8

Total: 90

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 )

2250 Hz
2150 Hz
2300 Hz
2060 Hz

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