Advertisements
Advertisements
प्रश्न
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
Advertisements
उत्तर
We have to calculate the depth in water.
Given: Time taken to hear the echo t = 0.1 s
So time taken for sound to reach the reflecting surface
`(t_r) = 0.1/2` s
= `1/20` s
Speed of sound in water ν = 1,500 m/s
Therefore, distance of reflecting surface from the observer is
= `(v) xx (t_r)`
= `(1500) xx (1/20)` m
= 75 m
APPEARS IN
संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound? Give a reason for your answer.
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is the minimum distance needed for an echo?
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
What is an echo? Write the conditions to hear an echo.
