A whistle of frequency 1000 Hz is sounded on a car travelling
towards a cliff with velocity of 18 m s⁻¹ normal to the cliff.
If c = 330 m s⁻¹, then the apparent frequency of the echo as
heard by the car driver is nearly
(a) 1115 Hz (b) 115 Hz
(c) 67 Hz (d) 47.2 Hz
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Explanation:
your answer is a. 1115..hz
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