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The flash of lightening is seen much bef...

The flash of lightening is seen much before we hear the thunder because

A

the speed of light is more than the speed of sound.

B

the speed of sound is more than the speed of light.

C

the speed of light is equal to the speed of sound.

D

the speed of sound is more in vacuum than in air.

Text Solution

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The correct Answer is:
A
The lightning is seen much before we hear the thunder because the speed of light is more than the speed of the sound in a given medium.
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Statement-1 : The flash of lightening is seen before the sound of thunder is heard Statement-2 : The sound of thunder is produced after the flash of lightening.

Assertion: The flash of lightening is sees before the sound of thunder is heard. Reason: Speed of sound is greater than speed of light.

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The flash of lightning, produced at a distance of 10 km above the ground level is seen much before hearing the thunder bolt. Find the time gap between the two events observed by a person on the ground if the time taken by the lightning to reach the surface of earth is negligible. (velocity is sound = 330 ms^(-1) and velocity of light = 3 xx 10^(8) ms^(-1) .)

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PEARSON IIT JEE FOUNDATION-SOUND-CONCEPT APPLICATION (LEVEL-1)
  1. The velocity of a wave is 220 ms^(-1), the distance travelled by the w...

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  2. An echo of sound produced by a person, is heard from a distant tower a...

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  3. The flash of lightening is seen much before we hear the thunder becaus...

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  4. Which of the following materials is the best absorber of sound ?

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  5. The pitch of sound is determined by the of vibration.

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  6. When two tunning forks A and B, having frequencies 512 Hz and 212 Hz, ...

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  7. The time period of a seconds pendulum is s.

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  8. The frequency of a vibrating body is 100 Hz. Its time period is

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  9. The velocity of sound in vacuum is m s^(-1)

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  10. The time taken to displace a vibrating body from its mean position to ...

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  11. Which of the following statements is wrong?

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  12. As the amplitude of a vibrating body increases, the loudness of the so...

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  13. A tabla or a drum is an example of a

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  14. The loudness of sound is measured in .

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  15. Loudness of a sound in the range of 5 dB - 8 dB is .

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  16. When the length of the pendulum increases, the time period of the pend...

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  17. Arrange the following steps in a sequential order to verify the laws o...

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  18. Write the following statements in a sequential order to find the depth...

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  19. Match the following Column I to Column II

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  20. The relationship between velocity, wavelength and frequency is

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