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प्रश्न
The incidence of ______ in daily life shows that the velocity of sound is less than the velocity of light.
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उत्तर
The incidence of thunderstorms in daily life shows that the velocity of sound is less than the velocity of light.
Explanation:
In a thunderstorm, we see the flash of lightning before we hear the sound of thunder. This happens because light travels much faster than sound. Light reaches our eyes almost instantly, while sound takes more time to reach our ears. Therefore, thunderstorms show that the velocity of sound is less than the velocity of light.
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संबंधित प्रश्न
Write true or false for a given statement.
Sound can travel in a vacuum.
Write the approximate speed of sound in steel.
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.
Guess which sound has a higher pitch:
Which of the following is the speed of sound in copper and which in aluminium?
(a) 5100 m/s
(b) 1500 m/s
(c) 3750 m/s
Which term is used to denote a speed greater than the speed of sound?
What is the time-period of a tuning fork whose frequency is 200 Hz?
Calculate the frequency of a wave whose time-period is 0.02 s.
A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?
When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
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.
The speed of highly penetrating ultrasonic waves is :
The speed of sound in air at 0°C is 332 m/s. If it increases at the rate of 0.6 m/s per degree, what will be the temperature when the velocity has increased to 344 m/s?
The velocity of sound in solid is ______ than the velocity of sound in air.
The Velocity of sound is high in gases than liquids.
Establish the relationship between the speed of sound, its wavelength and frequency. If the velocity of sound in air is 340 m s–1, calculate
(i) wavelength when the frequency is 256 Hz.
(ii) frequency when the wavelength is 0.85 m
The speed of sound in a gaseous medium depends on ______.
Sound travels faster in ______ and slower in ______.
The speed of sound in a gaseous medium depends on the nature of the gas.
Numerical problems:
A Sound wave travels at a speed of 344 ms-1. If the wavelength is 1.5 cm, what is the frequency of the Wave? Will it be audible?
