wave_mechanics dopplers_effect Question 62
Question: A bus is moving with a velocity of 5 m/s towards a huge wall. the driver sounds a horn of frequency 165 Hz. If the speed of sound in air is 355 m/s, the number of beats heard per second by a passenger on the bus will be
[KCET 2001; BHU 2002]
Options:
A) 6
B) 5
C) 3
D) 4
Show Answer
Answer:
Correct Answer: B
Solution:
According the concept of sound image $ n’=\frac{v+v _{B}}{v-v _{B}}\times n=\frac{355+5}{355-5}\times 165=170 $ Hz Number of beats $ =n’-n=170-165=5 $
BETA
