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The speed of electromagnetic waves in va...

The speed of electromagnetic waves in vaccum depends upon the source of radiation.

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The speed of all electromagnetic waves in vaccum is `3xx10^(8)ms^(-1)` and does not depend upon the source of radiation.
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Knowledge Check

  • The speed of electromagnetic wave in vacuum

    A
    Increases as we move from `gamma`-rays to radio waves
    B
    Decreases as move from `gamma`-rays to radio waves
    C
    Is same for all of them
    D
    None of these

  • The speed of electromagnetic waves in air is

    A
    `3 xx 10^(5)` km/s
    B
    `3 xx 10^(6)` km/s
    C
    `3 xx 10^(7)` km/s
    D
    `3 xx 10^(8)` km/s

  • The speed of electromagnetic wave is same for

    A
    odd frequencies
    B
    even frequencies
    C
    all frequencies
    D
    all intensities

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