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प्रश्न
What is the ratio of speed of light to speed of sound?
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उत्तर
The ratio of speed of light to the speed of sound is 9.1 x 105.
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संबंधित प्रश्न
Write true or false for a given statement.
A ticking clock sound is heard late when heard through a metal.
What type of wave is represented :
(a) by density-distance graph?
(b) by displacement-distance graph?
Draw a displacement-distance graph of a wave and mark on it, the amplitude of wave by the letter 'a' and wavelength of wave by the letter λ.
An observer A fires a gun and another observer B at a distance 1650 m away from A hears its sound. If the speed of sound is 330 m s-1, find the time when B will hear the sound after firing by A.
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?
Sound travels in air:
What happens to the speed of sound when it gases from a solid to a gaseous state?
Assertion: The sound of thunder is heard a little later than the flash of light.
Reason: The speed of sound is much less than the speed of light.
