wiz-icon
MyQuestionIcon
MyQuestionIcon
13
You visited us 13 times! Enjoying our articles? Unlock Full Access!
Question

A police car moving at 22 m/s, chases a motorcylist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle, if it is given that he does not observe any beats.

A
33 m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
22 m/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Zero
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
11 m/s
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 11 m/s
n1= Frequency of the police car horn as heard by observer (motorcylist)
n2 = Frequency of the siren heard by the motorcyclist.
v2=Speed of motor cyclist
n1=330v33022×176;n2=330+v330×165
Given that
n1=n2330v33022×176=330+v330×165v=11 m/s.

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Beats
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon