Q.

A band playing music at a frequency n is moving towards a wall at a speed vb . A motorist is following the band with a speed v m,-. If v is the speed of sound, the expression for the beat frequency heard by the motorist is

Difficult

Unlock the Full Solution and Master the Concept

Get a detailed solution and exclusive access to our masterclass to ensure you never miss a concept

By Expert Faculty of Sri Chaitanya

v+vmv+vbn

v+vmv−vbn

2vbv+vmv2−vb2n

2vmv+vbv2−vb2n

answer is 3.

(Detailed Solution Below)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

The motorist receives two sounds : direct one and that reflected from the wall' For direct sound,n′=v+vmv+vbn For reflected sound, the reflected frequency of sound will be n′′=VV−vbn This frequency is received by the moving motorist. The apparent frequency received by him is given by n′′′=v+vmvn′′ =v+vmvvv−vbn=v+vmv−vbn ∴ Beat frequency =n"′−n′ =v+vmv−vbn−v+vmv+vbn =v+vm2vbv2−vb2n

Choose your Grade and Exam

Connect with our

Expert Counsellors

access to India's best teachers with a record of producing top rankers year on year.

+91

We will send a verification code via OTP.