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प्रश्न
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उत्तर
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संबंधित प्रश्न
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
| Column A | Column B |
| (a) Vibrations cause | (1) absorb sound |
| (b) A shriller sound is | (2) second |
| (c) Unit of frequency | (3) sound |
| (d) Unit of time period | (4) of high pitch |
| (e) Curtains | (5) hertz |
Arrange the speed of sound in gases Vg, solids Vs and liquids VLin an ascending order.
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Select the correct option:
A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called:
Draw a displacement-time graph for water wave.
200 waves pass through a point in one second. Calculate the time period of wave.
Define one hertz.
What type of sound is produced by elephants and whales?
Lightning can be seen the moment 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).
