Two aeroplane A and B are approaching each other and their velocities are 108 km/hr and 144 km/hr respectively.The frequency of a note emitted by Aas heard by the passenger in B is 1170 Hz.Calculate the frequency of the note heard by the passenger in A.[velocity of sound 350 `m(s)^-1`].

A train moving with speed 72 Km/hr blows its whistle of 200 Hz.What frequency is heard by a stationary observer?[velocity of sound in air = 330 m(s)^-1 ]

An ambulance blowing a siren of frequency 700 Hz is travelling towards a wall with a speed 2 m(s)^-1.Calculate the number of beats heard in one second by the driver of the ambulance.(velocity of sound = 350 m(s)^-1 )

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s.The frequency heard by the observer in Hz is (velocity of sound = 333m/s)

Two organ pipes one open at both ends,and the other open at one end only give their fundamental noteswhose frequencies differ by 25 vibration per second.The length of the open pipre is 96 cm.Calculate the length of the closed pipe if the velocity of sound in air is 330 m(s)^-1 .

A train approaching a hill at a speed of 1 Km a minute blows a whistle of frequency 480 Hz.Calculate the frequency which will be recorded byan instrument on the top of the hill.[Velocity of sound = 330 m/s]

A train whistling while approaching a railway platform with a speed of 90 km(s)^-1 .The frequency of sound of the whistle is 600 Hz.If the velocity of sound in air is 325 m(s)^-1 ,calculate the apparent frequency of the sound of the whistle as heard by an observer standing on the platform.

A train approaching a station at 36 km/hr blows its whistle of 320 Hz.What frequency is heard (i)in the station and (ii)by a stationary observer behind the train?

Two train 100 m and 89 m in length are running in opposite directions with a velocity 40 km/hr and 30 km/hr. At what time they will completely cross each other.

A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s.The speed of the sound id 330 m/s.The frequency heard by the observer is

At each of the stations A and B a siren its surrounding with a constant of frequency pf 250 Hz.A cyclist from A proceeds towards B with a velocity 12km/hr and hears 5 beats per second.Calculate the velocity of sound.