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प्रश्न
Name two sound absorbing materials (or objects) which can make our big room less echoey.
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उत्तर
Curtains and carpets are two sound-absorbing materials that can make big rooms less echoey.
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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
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Distinguish between mechanical and electromagnetic waves.
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Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
Explain why, the ceilings of concert halls are curved.
Explain reflection at the boundary of a rarer medium.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
