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If a particle travelling with a speed of 0.9 of the speed of sound and is emitting radiations of frequency if 1kHz and moving towards the observer, what is the apparent frequency?

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If a particle travelling with a speed of 0.9 of the speed of sound and is emitting radiations of frequency if 1kHz and moving towards the observer, what is the apparent frequency?

(a) 1.1 kHz

(b) 0.8 kHz

(c) 0.4 kHz

(d) 10 kHz

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Question is from Stationary Waves topic in division Waves of Engineering Physics I

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The correct answer is (d) 10 kHz

Explanation: γ^‘=v/(v-vs)×γ

=v/(v-0.9v)×1kHz=10kHz.

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