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प्रश्न
Answer briefly.
What do you mean by an echo?
उत्तर
An echo is the repetition of the original sound because of reflection from some rigid surface at a distance from the source of sound.
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संबंधित प्रश्न
Answer briefly.
State any two applications of acoustics.
Solve the following problem.
An echo-sounder in a fishing boat receives an echo from a shoal of fish 0.45 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal?
Solve the following problem.
A girl stands 170 m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before.
- If she makes 60 claps in 1 minute, what value should be the speed of sound in air?
- Now, she moves to another location and finds that she should now make 45 claps in 1 minute to coincide with successive echoes. Calculate her distance for the new position from the wall.
Solve the following problem.
A man standing between 2 parallel cliffs fires a gun. He hears two echoes one after 3 seconds and other after 5 seconds. The separation between the two cliffs is 1360 m, what is the speed of sound?
To hear an echo, the total distance covered by sound from the point of generation to the reflecting surface and back should be atleast ____________.
