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प्रश्न
State two differences between the light and sound waves.
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उत्तर
(i) The light waves can travel in vacuum while sound waves need a material medium for propagation.
(ii) The light waves are electromagnetic waves while sound waves are the mechanical waves.
संबंधित प्रश्न
How is the frequency of a stretched string related to its length?
How is the frequency of a stretched string related it’s tension?
Name the principle on which a soundboard works.
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
What are mechanical waves?
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
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 |
