Verified Solution • 2025–26 Session
moderate
QNEET-2016-Ph-1078: NEET 2016 Physics - Class 11 NEET-2016-Ph-1078 Solution: A siren emitting a sound of frequency 800 Hz moves away from an …
A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of . Then the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = ) 838 Hz 885 Hz 765 Hz 800 Hz
Multiple Choice Options
- A 838 Hz
- B 885 Hz
- C 765 Hz
- D 800 Hz
Step-by-Step Verified Solution
According to Doppler's effect in sound
Apparent frequency,
n _ = v v _ v S n 0
= 330 330 _ 15 ( 800 ) = 330 _ 800 315 = 838 H z
The frequency of sound observer hears in the echo reflected from the cliff is 838 Hz.