Wave Mechanics Question 55
Question: The echo of a gunshot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s)
[JIPMER 1999]
Options:
A) 1400 m
B) 2800 m
C) 700 m
D) 350 m
Show Answer
Answer:
Correct Answer: A
Solution:
Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is $ t=\frac{2d}{v} $
Therefore $ 8=\frac{2d}{350} $
Therefore $ d=1400,m $ .
BETA
