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A sound source is moving towards a stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is
Options
(a) (10/9)
(b) (10/9)²
(c) (11/10)²
(d) (11/10)
Correct Answer:
(10/9)
Explanation:
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let the origional frequency is F.Now we know that when source moving toward listener then according to doppler effect the frequency of sound waves will be
f''=vF/v-b
f''=340F/340-34
as source is moving with 1/10 of speed of sound so we put 340/19=34,as speed of sound in air 340 m/s
so f''=340/306=10F/9 ratio will be f''/f=10/9