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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.
संबंधित प्रश्न
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz
State the use of echo by a bat, dolphin and fisherman.
How do bats avoid obstacles in their way, when in flight?
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
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.
Write the approximate value of the speed of sound in water.
What is meant by echo depth sounding?
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
What do you understand by the ‘Echolocation system of Dolphins’?
