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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
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
Select the correct alternative :
The speed of sound in water is
Can sound travel through solids and liquids ? In which of these two does it travel faster ?
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.
What is the speed of sound :
(a) in air?
(b) in water?
(c) in iron?
A jet aircraft flies at a speed of 410 m/s. What is this speed known as?
A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?
Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
Fill in the blank with suitable word :
The speed of sound in a solid is ............... than the speed of sound in air.
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.)
Why does the flash of lighting reach earlier than the sound of thunder?
The velocity of sound in air at a particular temperature is 330 ms–1. What will be its value when temperature is doubled and the pressure is halved?
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 _____.
Air temperature in the Rajasthan desert can reach 46°C. What is the velocity of sound in air at that temperature? (V0= 331 ms–1)
When temperature increases the speed of sound ______.
The velocity of sound by a tuning fork frequency of 480 Hz is 340 ms Its wavelength is ______.
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?
