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The speed of electromagnetic waves in ai...

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

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • An electromagnetic wave , whose wave normal makes an angle of 45^(@) with the vertical , travelling in air strikes a horizontal liquid surface . While travelling through the liquid it gets deviated through 15^(@) . What is the speed of the e.m. wave in the liquid , if the speed of electromagnetic wave in air is 3xx 10^(8) m/s ?

    A
    `1.5 xx 10^(8)` m/s
    B
    `2.1 xx 10^(8) ` m/s
    C
    `2.5 xx 10^(8)` m/s
    D
    `(sqrt2)/(3) xx 10^(8)` m/s

  • The speed of electromagnetic waves in free space is

    A
    `mu_0 epsi_0`
    B
    `(1)/(mu_0 epsi_0)`
    C
    `sqrt( mu_0 epsi_0)`
    D
    `(1)/( sqrt((mu_0 epsi_0))`

  • 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

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