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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
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
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Sound travels faster in ________ than in liquids.
Write the approximate speed of sound in water .
What is the speed of sound :
(a) in air?
(b) in water?
(c) in iron?
Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.
A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s, how much time will the sound of factory siren take to reach the worker?
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a village
The speed of highly penetrating ultrasonic waves is :
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How many times be as fast as the other?
Write the formula for speed of sound in a gas using Laplace correction.
Numerical problem.
A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard? (Given g = 10 m s–2 and speed of sound = 340 m s–1)
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is _____.
The velocity of sound is independent of temperature.
Why does sound travel faster on a rainy day than on a dry day?
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
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.
