Two aeroplanes A and B are moving towards each other with a speed of 120 m/s. The frequency of the shistle emitted by A is 100 Hz. What is the apparent frequency of the whistle as heard by the captain of plane B? (Velocity of sound in air = 360 m/s)
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 source is moving towards an observer with a speed of 20 m / s and having frequency of 240 Hz . The observer is now moving towards the source with a speed of 20 m / s . Apparent frequency heard by observer, if velocity of sound is 340 m / s , is
A source of sound emits waves with frequency f Hz and speed V m / sec . Two observers move away from this source in opposite directions each with a speed 0.2 V relative to the source. The ratio of frequencies heard by the two observers will be
An observer and a source both are moving away with velocity 20 m/s each in opposite direction. If frequency of sound observed is 1800Hz then what is actual frequency (velocity of sound= 340 m/s)
In a guitar , two strings A and b made of same material are slightly out of tune and produce beats of frequency 6 Hz. when tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 hz, the original frequency of B will be
Two trains A and B are moving on parallel tracks in opposite direction at same speed of 30 ms^( –1) . Just when the engines of the two trains are about to cross, the engine of train A begins to sound a horn. The sound of the horn is composed of components varying in frequency from 900 Hz to 1200 Hz. The speed of sound in air is 330 ms^( –1) . (a) Find the frequency spread (range of frequencies) for the sound heard by a passenger in train A. (b) Find the frequency spread heard by a passenger in train B.
Two tuning forks A and B give 4 beats/s when sounded together. If the fork B is loaded with wax 6 beats/s are heard. If the frequency of fork A is 320 Hz, then the natural frequency of the tuning fork B will be
One train A 100m long is moving in a direction with a speed of 20m/s . Another train B 150m long is moving with a speed of 30m/s in the opposite direction.The train B crosses the train A in a time A) 5s B) 10s C) 18s D) None of these
