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प्रश्न
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उत्तर
The sound heard after reflection from a rigid obstacle (such as cliff, a hillside, a wall of a building, edge of a forest etc.), is called an echo.
Conditions necessary for echo formation are:
1. The minimum distance between the source of sound and its reflector should be 17 m.
2. Reflected sound should reach the person atleast 0.1 second after the original sound is heard.
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संबंधित प्रश्न
Name the characteristic of sound in relation to its waveform
State two factors on which the speed of a wave travelling in a medium depends.
State two differences between the light and sound waves.
What is a stethoscope ? Name the principle on which a stethoscope works.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
What is mean by the reflection of sound?
What is meant by an echo? Explain.
