1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# Two bikes moving in opposite directions approach each other with speed of 40 m/s and 20 m/s respectively. The first bike sounds a horn having a frequency 380 Hz. The frequency heard by the biker of the second bike is [velocity of sound in air is 340 m/s]

A
450 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
460 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
465 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
456 Hz
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

## The correct option is D 456 HzFrom Doppler effect, Apparent frequency, fapp=f0[v+v0v−vs] wheere f0 = original frequency blower by source =380 Hz Velocity of sound in air v=340m/s v0 = velocity of observer (2ndbiker)=20 m/s vs = velocity of source (1stbiker)=40 m/s Frequency heard by the biker of sound bike. fapp=380(340+20340−40)=380×360300=456 Hz

Suggest Corrections
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program