Home
Class 12
PHYSICS
A bus is moving towards a huge wall with...

A bus is moving towards a huge wall with a velocity of `5m//s^(-1)`. The driver sounds a horn of frequency `200 Hz`. The frequency of the beats heard by a passenger of the bus will be ………… `Hz` (Speed of sound in air `= 342m//s^(-1))`

Text Solution

Verified by Experts

The first frequency the driver of bus hears is the original frequency 200 Hz. The second frequency the driver hears is the frequency of sound reflected from the wall. The two frequencies of sound heard by the driver are
I. Original frequency (200Hz)
II. Frequency of sound reflected from the wall (v')
The frequency of sound reflected from the wall
`v'=v[(u+u_(0))/(u-u_(s))]`
`v'=200[(342+5)/(342-5)]=205.93Hz`
`therefore`Frequency of beats=v'=v=205.93-200=5.93=5Hz

Promotional Banner

Similar Questions

Explore conceptually related problems

A bus is moving towards a gauge wall with a velocity of 5m//s^(-1) . The driver sounds a horn of frequency 200 Hz . The frequency of the beats heard by a passenger of the bus will be ………… Hz (Speed of sound in air = 342m//s^(-1))

a bus is moving with a velocity 4 m/s towards a wall, the driver sounds a horn of frequency 173 Hz . if the speed of sound in air is 350 m/s. the number of beat heard per second by a passanger on the bus will be

A bus is moving with a velocity of 5 ms^(-1) towards a huge wall. The driver sound a horn of frequency 165 Hz. If the speed of sound in air is 335 ms^(-1) , the number of beats heard per second by a passenger inside the bus will be

a bus is moving in a circle around a listener with speed 20 m/s of radius 2 m. Bus driver blows a horn with frequency 210 Hz. the frequency of sound heard by the listener is

Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz . the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 340 m/s )

A car is moving with 90 km h^(-1) blows a horn of 150 Hz, towards a cliff. The frequency of the reflected sound heard by the driver will be (speed of sound in air is 340 ms^(-1) )

A car is moving with a velocity of 5 m//s towards huge wall. The driver sounds a horn of frequency 165 Hz . If the speed of sound in air is 335 m//s , the number of beats heard per second by the driver is

a bus is moving towards and stationary observer with speed 20 m/s blows a horn of frequency 200 Hz. the frequency of sound heard by the observer is approximately ( take speed of sound 320 m/s)

A person P is standing at a perpendicular distance of 200m from point Q on a highway. A bus B is moving with a speed of 42.43ms^(-1) towards point Q on the highway. The driver of the bus blows a horn of frequency 1300 Hz. What is the frequency of sound received by the person P, when the bus is distant 200 m from Q. speed of sound in air is 330ms^(-1)