Two aeroplanes A and B are approaching each other and their velocities are `108 kmh^(-1)` and `144 kmh^(-1)` respectively. The frequency of a note emitted by A as heard by the passangers in B is 1170 Hz. Calculate the frequency of the note heard by the passangers in A. Velocity of sound `= 350 ms^(-1)`.

Two buses X and Y are approaching each other and their velocities are 120 km/hr and 140 km/hr, respectively. The frequency of horn emitted by X as heard by the passengers in Y is 1100 Hz. What will be the frequency of the horn heard by the passenger in X. Velocity of sound = 340 m/s.

Two aeroplanes are approaching eachother and their velocities are 100 and 240 km // h . The frequency of a note emitted by the first as heard by the passengers in the other is 100. Calculate the true frequency of the note as head by its own passengers. Take the velocity of sound as 1200km.//hr.

Two cars P and Q are approaching each other with velocities of 36 km/h and 72 km/h respectively. The frequency of a note emitted by car P as heard by the person sitting in car Q is 850 Hz. What will be the frequency of note heard by person sitting in car P ? Velocity of sound = 340 m/s.

Two cars X and Y are approaching each other with velocities 36km/h and 72 km/h respectively. The frequency of a whistle sound as emitted by a passenger in car X, heard by the passenger in car Y is 1320 Hz. If the velocity of sound in air is 340 m/s, the actual frequency of the whistle sound produced is __________Hz.

Two trains A and B are approaching each other with 108 km h^(-1) and 126 km h^(-1) , respectively . If the train A sounds a whistle of frequency 500 Hz , find the frequency of the whistle as heard by a passenger in the train B . (a) before the trains cross each other and (b) after the trains cross each other . (Take velocity of sound as 330 m s^(-1) )

Two aeroplanes 'A' and 'B' are moving away from one another with a speed of 720kmph . The frequency of the whistle emitted by 'A' is 1100Hz . The apparent frequency of the whistle as heard by the passenger of the aeroplane 'B' is (velocity of sound in air is 350ms^(-1) ).

A motor car is approaching towards a crossing with a velocity of 72 " km h"^(-1) . The frequency of the sound of its horn as heard by a policeman standing on the crossing is 260 Hz. The frequency of horn is

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)

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a hiss from which an echo is heard. Calculate the frequency of the echo heard by the driver. (velocity of sound in air in 340(m)/(s) .)