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प्रश्न
A medium is necessary for ______ of sound.
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उत्तर
A medium is necessary for propagation of sound.
संबंधित प्रश्न
What are wavelength, frequency, time period and amplitude of a sound wave?
Describe an experiment to show the production of sound having low and high pitch.
Why are the waves mentioned by you not audible to us?
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?
The speed of sound is more in hydrogen than in nitrogen. Is this statement true? Give a reason for your answer.
What cause sound? Why do we require a material medium for the transmission of sound?
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
______ is an unwanted sound.
