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प्रश्न
What kinds of waves are produced in solids, liquids, and gases?
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उत्तर
Elastic waves or material waves are produced in solids, liquids and gases.
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संबंधित प्रश्न
Describe an experiment to show the production of sound having low and high pitch.
Why are musical instruments provided with more than one string ?
What is loudness of sound? What factors does it depend on?
Fig. shows three ways in which a string of length l in an instrument can vibrate.
 |
 |
 |
| (i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
How does the frequency of sound given by a stretched string depend on its
- length,
- tension?
What do you mean by the term frequency of a wave? State its S.I. unit.
State the speed of (i) light and (ii) sound in air?
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
How does the sound produced by a vibrating object in a medium reach your ears?
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
