Home
Class 12
PHYSICS
Two aeroplanes A and B, each moving with...

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

200 Hz

B

260 Hz

C

280 Hz

D

300 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

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 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 )

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 motor car blowing a horn of frequency 124 vib//s moves with a velocity 72 km//hr towards a tall wall. The frequency of the reflected sound heard by the driver will be (velocity ofsound in air is 330 m//s )

A source and an observer move away from each other with a velocity of 10 m/s with respect to ground. If the observer finds the frequency of sound coming from the source as 1950 Hz , then actual frequency of the source is (velocity of sound in air = 340 m/s )

A man is watching two trains, one leaving and the other coming in with equal speeds of 4 m//s . If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m//s ) will be equal to

The audible frequency range of human ear is 20 Hz and 20 kHz. The corresponding wavelength range is [speed of sound in air = 340 m/s]

A car is travelling with a velocity of 40 m//s towards a source of sound of frequency 1000 Hz. If sound velocity is 330 m//s , then apparent frequency heard by the observer (in Hz) is

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 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