Question
What is echo? Discuss the echo method to measure the large distances.
Solution
The reception of wave after reflection is called 'echo'.
When echo method is used to measure large distances, we send the wave (sound or light) towards the object and the reflected wave is again received.
Let 't' be the time after which echo is observed.
Obviously in 't' time the wave travels the distance twice the distance between source of wave and object.
If c is the velocity of wave then,
ct = 2x
x = ct/2
When echo method is used to measure large distances, we send the wave (sound or light) towards the object and the reflected wave is again received.
Let 't' be the time after which echo is observed.
Obviously in 't' time the wave travels the distance twice the distance between source of wave and object.
If c is the velocity of wave then,
ct = 2x
x = ct/2
