CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

A person riding a car moving at 72 km/h sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing on the road (i) in front of the car (ii) behind the car? Speed of sound in air = 340 m/s.


A

1250 Hz, 1181 Hz

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

1328 Hz, 1181 Hz

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

1620 Hz ,1080 Hz

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

None of these

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B

1328 Hz, 1181 Hz



i)Given vs = 72 km/hour = 20 m/s, f = 1250
Apparent frequency when car is approaching
a)For second case apparent frequency will be=(340+0340+20)×1250=1181Hz


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Doppler's Effect
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon