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We see flash earlier than the thunder. D...

We see flash earlier than the thunder. Discuss.

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Flash (light) travels with a speed of `3 xx 10^8 m//s` whereas thunder (sound) travels with a speed of `340 m//s`.
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Why do we see lighting before we hear the thunder ?

(a) What is the function of pinna ? (b) You observe that the delay between a lighting flash and the thunder is 8 s . How far away is the lightning ?

Knowledge Check

  • We hear a thunder because

    A
    A lot of charge goes in lightning
    B
    The air heats up and expands all of a sudden
    C
    Clouds bang against each other
    D
    Cloud burst

  • 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.

  • 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.

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    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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