A person clapped his hands near a cliff and heard the echo after 4 seconds. What is the distance of the cliff from the person when the speed of the sound is 344 m/s?

Correct option is D

The correct answer is (d) 688 m.
· When a person claps their hands near a cliff and hears an echo, the sound travels from the person to the cliff and back. This means the sound travels twice the distance between the person and the cliff.
· The speed of sound in air is given as 344 m/s.
· The total time taken for the sound to travel to the cliff and back is 4 seconds.
· To find the distance to the cliff, we consider that the sound covers this distance twice (to the cliff and back) in the given time.
· Thus, the distance to the cliff is half of the total distance traveled by the sound in 4 seconds, which calculates to 688 meters.
Information Booster:
· Echo: An echo is the reflection of sound that arrives at the listener after a delay. This delay is due to the sound wave traveling to a reflective surface (like a cliff) and back to the listener.
· Speed of Sound: The speed at which sound waves travel through a medium, which in this case is air at 344 meters per second (m/s).