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A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

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Knowledge Check

  • The oscillating electric and magnetic field vectors of an electromagnetic waves are oriented along :

    A
    mutually perpendicular directions and are in phase
    B
    mutually perpendicular directions and differ in phase by `90^(@)`
    C
    the same directions but differ in phase by `90^(@)`
    D
    the same direction and are in phase.

  • In an electromagnetic wave travelling in air, the amplitudes E_(0) and B_(0) of the electric and magnetic fields are related as (here c is the speed of the wave in air) :

    A
    `E_(0)=cB_(0)`
    B
    `E_(0)=(B_(0))/(c)`
    C
    `E_(0)=c^(2)B_(0)`
    D
    `E_(0)=B_(0)`

  • When a plane electromagnetic wave travels in vacuum, the average electric energy density is given by (here E_(0) is the amplitude of the electric field of the wave) :

    A
    `(1)/(4) epsilon_(0)E_(0)^(2)`
    B
    `(1)/(2) epsilon_(0)E_(0)^(2)`
    C
    `2 epsilon_(0)E_(0)^(2)`
    D
    `4 epsilon_(0)E_(0)^(2)`

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