Kelvi

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of $15 ms^{-1}.$ Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 $ms^{-1}$ )

medium

Waves

2016

physics

838 Hz

885 Hz

765 Hz

800 Hz

Explanation

To solve this problem, we need to use the Doppler effect formula for sound. $\\$ The siren is moving away from the observer and towards the cliff. $\\$ Let's break down the problem into two parts: $\\$ 1. Frequency heard by the cliff ( $f'$ ): $\\$ The frequency heard by the cliff is given by the formula: $\\ f' = \left(\frac{v}{v + v_s}\right) f \\$

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A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms−1.15 ms^{-1}. 15ms−1.Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330ms−1 ms^{-1}ms−1)

Explanation

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A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of $15 ms^{-1}.$ Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 $ms^{-1}$ )