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प्रश्न
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 |
उत्तर
| Ultrasonics | Frequency more than 20000 Hz |
| Speed of sound in air | 330ms-1 |
| Infrasonics | Frequency below 20Hz |
| Sound propagation | Needs material medium |
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संबंधित प्रश्न
Name the two characteristics of sound which differentiate two sounds from each other.
Name the characteristic which differentiates two sounds of the same pitch and same loudness.
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
Complete the following sentence :
Sound is produced by a ___________ body.
State the speed of (i) light and (ii) sound in air?
State three conditions necessary for hearing sound.
Lightning can be seen at the moment when it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs?
(speed of sound = 330 m/s).
