A person driving car at a constant speed of 15 m/s is approaching a vertical wall. The person notices a change of 40 Hz in the frequency of his car’s horn upon reflection from the wall. The frequency of horn is ________ Hz.
(Given: Speed of sound : 30 m/s)

The driver of as car approaching a vertical wall notices that the frequency of his car's horn charges from 440 Hz to 480 Hz when it gets reflected from the wal. Find the speed of the car if that of the sound is 330 ms^-1 .

If a person is driving a car at a speed of 30 m/s, then in how much time person will cover a distance of 1620 km?

A driver in a car , approaching a vertical wall notices that the frequency of his car horn , has changed form 440 Hz to 480 Hz , when it gets reflected form the wall . If the speed of the sound in are 345 m/s , then the speed of the car is :

There are two horns H1 and H2 in a car. When sounded together, the driver records 35 beats in 10 second. With horn H2 blowing and car moving towards a wall at a speed of 5 ms^( –1) , the driver noticed a beat frequency of 5 Hz with the echo. When frequency of H1 is decreased the beat frequency with two horns sounded together increases. Calculate the frequency of two horns. Speed of sound = 332 ms^( –1)

The driver of a bus approaching a big wall botices that the frequency of his bus's horn changes from 420 Hz to 490 Hz when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is "330 ms"^(-1) .

Calculate the apparent frequency of the horn of a car approaching a stationary listener with a velocity of 12 ms^(-1) . The frequency of horn is 500 Hz.The speed of sound is 332 ms^(-1) .

The driver of a car approaching a vertical wall notices that the frequency of the horn of his car changes from 400 Hz to 450 Hz after being reflected from the wall. Assuming speed of sound to be 340(m)/(s) , the speed of approach of car towards the wall is

A car is moving with a constant velocity 10 m//s towards the stationary wall. The car blows a horn of frequency 320 Hz . The velocity of sound in air is 330 m//s . The beats frequency received by the observer is

An engine driver moving towards a wall with a velocity of 60 m/s emits a note of 1400 Hz. Speed of sound in air is 340 m/s .The frequency of the note after reflection from the wall as heard by the engine driver is

A car travelling towards a hill at 10 m//s sound its horn which a frequency 500 H_(Z) . This is heard in a second car travelling behind the first car in the same direction with speed 20 m//s . The sound can also be heard in the second car by reflections of sound the hill. The beat frequency heard by the driver of the sound car will be (speed of sound in air = 340 m//s)