Home
Class 12
PHYSICS
A band playing music at a frequency f is...

A band playing music at a frequency `f` is moving towards a wall at a speed `v_(b)`. A motorist is following the band with a speed `v_(m)`. If `v` is the speed of sound, obtain an expression for the beat frequency heard by the motorist.

Text Solution

Verified by Experts

The correct Answer is:
`[n_(0)[[(v +v_(m))(2v_(b)))/((v^(2) - v_(b)^(2))]]]`
Apparent frequency received bymotorist directly from ban is
`n_(1) = n_(0)((v + v_(m))/(v + v_(b)))`
Apparent frequency received by motorist from reflected sound by wall is
`n_(1) = n_(0)((v + v_(m))/(v - v_(b)))`
Beat frequency
`n_(B) = n_(2) - n_(1)`
`(v + v_(m))((1)/(v - v_(b)) - (1)/(v+ v_(b)))`
`(2v_(b) (v + v_(m)))/((v^(2) - v_(b)^(2)) )n_(0)`
Promotional Banner

Topper's Solved these Questions

  • WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Discussion Question|26 Videos

  • WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Conceptual MCQs Single Option Correct|24 Videos

  • WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Practice Exercise 6.7|10 Videos

  • WAVE OPTICS

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved Numerical Problems|28 Videos

  • X-RAYS

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved Numerica Problem for Preparation|23 Videos

Similar Questions

Explore conceptually related problems

A band playing music at a frequency f is moving towards a wall at a speed v_(b) . A motorist is following the band with a speed v_(m) . If the speed of sound, obtain an expression for the beat frequency heard by the motorist.

A band playing music at a frequency f_(0) is moving towareds a wall at a speed v_(0) . A motorist is following the band with a speed v_(m) . If v be the speed of the sound the expression for beat frequency heard by motorist is

A car moves towards a hill with speed v_(c) .It blows a horn of frequency f which is heard by an observer following the car with speed s .The speed of sound in air is v . find frequency heard by the observer.

A car moves towards a hill with speed Vc It blows a horn of frequency f which is heard by an observer following the car with speed Vo The speed of sound in air is V. Find the frequency heard by the observer

Two persons A and B ,each carrying a source of sound of frequency nu ,are standing a few meters a part in quiet field. A starts moving to words B with a speed u. If V is the speed of sound,the number of beats heard per second by A will be

A source of sound is moving towards a high wall with a speed of 20 m/s. The frequency of the sound produced by the source is 400 Hz. If the speed of the sound is 340 m/s, then the beat frequency heard by a person standing near the wall will be

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n_(1) ,the value of n_(1)//n is

A source of sound is moving towards an observer at rest with a speed V = 0.1 times the speed of sound. Find the apparent freuency as heard by the observer if original frequency is 400 Hz.