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

Question

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

Accepted Answer

$838 	ext{ Hz}$

Questions

Questions

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

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