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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
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
State two factors on which the speed of a wave travelling in a medium depends.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Name the principle on which a soundboard works.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
What is a megaphone ? Name the principle on which a megaphone works.
What do you understand by the ‘Echolocation system of Dolphins’?
Write short notes on reflection of sound waves from plane and curved surfaces.
