A source of sound is moving towards a stationary observer with (1/10) th the of the speed of sound. The ratio of apparent to real frequency is (a) 10: 9 (b) 11: 10 (c) (11)²: (10)² (d) (9)²: (10)²

Answer: (a). Source approaching: n'/n = (v)/(v - vs). n'/n = (v)/(v - v/10) = 10/9 So the answer is (a) 10: 9.

A source of sound is moving towards a stationary observer with (1/10)… | MHT CET 2023 (14 May, Shift 2)

Q28MHT CET 2023 · 14 MAY · SHIFT 2Easy

Doppler Effect

A source of sound is moving towards a stationary observer with $\left(\frac{1}{10}\right)$ th the of the speed of sound. The ratio of apparent to real frequency is

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Answer: (a)

Source approaching: $\frac{n'}{n} = \frac{v}{v - v_s}$ .
$\frac{n'}{n} = \frac{v}{v - v/10} = \frac{10}{9}$
So the answer is (a) $10 : 9$ .

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