Home
Class 12
PHYSICS
A train is moving on a straight track wi...

A train is moving on a straight track with speed `20 ms^(-1)` . It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound = `320 ms^(-1)`) close to

A

0.06

B

0.12

C

0.18

D

0.24

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

A car blowing a horn of frequency 350 Hz is moving normally towards a wall a speed of 5 m/s The beat frequency heard by a person standing between the car and wall is (speed of sound in air =350 m/s )

A passenger is sitting in a fast moving train. The engine of the train blows a whistle of frequency ‘n\ If the apparent frequency of sound heard by the passenger is n', then

The velocity of sound in air is 320ms^(-1) . An open organ pipe 40 cm long resonates at a frequency of 1200 Hz. Which overtone is it ?

A train A is travelling at a speed of 108 km hr^(-1) . The train approaches another train B standing on the platform. The engine of the train B blows its hom. The frequency of the horn as observed by the driver in train A is 504 Hz. The frequency of the hom of train B is (speed of sound = 330 ms^(-1) )

A person is standing on a railway platform. An engine blowing a whistle of frequency 640 Hz approaches him with a speed of 72 km//hr . The frequency of the note heard by the person is (velocity of sound is 340 m//s )

Two aeroplanes A and B, each moving with a speed of 720 km/hour, are moving directly away from each other. Aeroplane A emits a whistle of frequency 1080 Hz. The apparent frequency heard by a person in plane B will be (velocity of sound in air = 340 m//s )

A train has just completed a U-curve in a track which is a semicircle. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi-circular track. The driver blows a whistle of frequency 200 Hz. Velocity of sound is 340 m//s . Then the apparent frequency as observed by a passenger in the middle of a train when the speed of the train is 30 m//s is

A car is moving with a speed of 72 km-hour^(-1) towards a roadside source that enits sound at a frequency of 850 Hz. The car driver listens to the sound while approching the source and again while moving away from the source after crossing it. If the velocity of sound is 340 ms^(-1) , the difference of the two frequencies the driver hears is

Two cars moving in opposite directions approach each other with speed of 22 m//s and 16.5 m//s respectively. The driver of the first car blows a hom having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m//s ]:

A motor cycle starts from rest and accelerates along a straight path at 2m//s^(2) . At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest ? (Speed of sound = 330ms^(-2))