Question

A person in topless jeep is travelling with
uniform velocity 20 ms away from a
vertical mountain. The person blows horn
of the jeep and hears its echo from the
mountain. If actual frequency of horn is 630
Hz, the apparent decrease in the frequency
of echo with respect to actual frequency of
the horn is (velocity of sound in air = 340
ms-1)
(1) 35 Hz (2) 45 Hz (3) 70 Hz (4) 90 Hz​

Answer 1

Answer:

a) is the correct answer plz mark me as brainlist

Answer 2

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Correct option is (2) 45 Hz