A sound source is moving towards a stationary observer with (1/10) th the speed of sound, The ratio of apparent to real frequency is (a) 10/9 (b) 11/10 (c) (11/10)² (d) (9/10)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 sound source is moving towards a stationary observer with (1/10) th… | MHT CET 2025 (25 Apr, Shift 1)

Q10MHT CET 2025 · 25 APR · SHIFT 1Easy

Doppler Effect

A sound source is moving towards a stationary observer with $\left(\frac{1}{10}\right)$ th 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) $\frac{10}{9}$ .

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