When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

An echo was heard after 3s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 ms^-1 ?

What is the minimum time interval between the original sound and the reflected sound to hear a distinct echo?

A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s^(-1) )

A man’stationed between two hills fires a gun. He hears the first echo after 1 s and the second after 2 s. What is the distance between the hills. The speed of sound in air is 330 m/s.

A siren is fitted on a car going towards a vertical wall at a speed of 36 kmh^(-1) . A person standing on the ground behind the car, listeners to the siren sound coming directly from the source as well as that coming after reflection from the wall. Calculate the apparant frequencies of both the sounds. Velocity of sound 340ms^(-1) , frequency of the siren 500Hz.

A source of sound is movig with a speed 220 m(s)^-1 towards a stationary target.While moving,it emits a wave of frequency 1000 Hz.Some of the sound reaching the target get reflected back to the source as echo.Calculate the (i)frequency of sound as detected by the target and (ii)the frequency of echo as detected by the source?

A person is listening to a tone of 500Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

A persion clapped his hands in front of a wall and heard echo later 1s. If speed of sound m air is 330 m/s, find out the distance between the person and the wall.