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प्रश्न
During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why?
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उत्तर
The velocity of light is 3 × 108 m/s-1 whereas velocity of sound is 332 m/s-1. First we see the flash of light and then we hear the thunder.
As a result, lightning appears first and thunder follows. The thunderstorm may be far from us if there is simply lightning and no thunder.
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संबंधित प्रश्न
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
Write the approximate speed of sound in water .
A boy on a hill A fires a gun. The other boy on hill B hears the sound after 4 s. If the speed of sound is 330 m s-1, find the distance between the two hills.
A sound signal of 128 vibrations per second has a wavelength of 2.7 m. Calculate the speed with which the wave travels.
Fill in the blank with suitable word :
The speed of sound in a solid is ............... than the speed of sound in air.
The drawing shows a ship 800 m from a cliff. A gun is fixed on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again.
(a) What is the name of this effect ?
(b) What happens to the sound at the cliff ?
(c) How far does the sound travel in 5 seconds ?
(d) Calculate the speed of sound.
Why does sound travel faster on a rainy day than on a dry day?
The thunder of cloud is heard 9.8 seconds later than the flash of lightning. If the speed of sound in air is 330 ms–1, what will be the height of the cloud?
Assertion: The speed of sound in air is less than the speed of sound in solid.
Reason: If we increase the temperature of medium, the speed of sound increases in any medium.
The speed of sound in a gaseous medium depends on the nature of the gas.
