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    3.

    Which of these is an INCORRECT statement about electromagnetic waves in free space?

    A

    The electric and magnetic fields are perpendicular to each other and to the direction of wave propagation.

    B

    They travel at the speed of light in free space.

    C

    Changing the frequency changes the speed of the electromagnetic wave.

    D

    They carry both energy and momentum.

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    9.

    The amplitude of electric field in a parallel beam of light of intensity 4  Wm24{\rm{\;W}}{{\rm{m}}^{ - 2}} is

    A

    40.5  NC140.5{\rm{\;N}}{{\rm{C}}^{ - 1}}

    B

    45.5  NC145.5{\rm{\;N}}{{\rm{C}}^{ - 1}}

    C

    50.5  NC150.5{\rm{\;N}}{{\rm{C}}^{ - 1}}

    D

    55.5  NC155.5{\rm{\;N}}{{\rm{C}}^{ - 1}}

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    10.

    Which of the following equations represents a wave traveling along the negative x-axis?

    A

    y=Asin(ωtkx)y = A \sin(\omega t - kx)

    B

    y=Asin(kxωt)y = A \sin(kx - \omega t)

    C

    y=Asin(ωt+kx)y = A \sin(\omega t + kx)

    D

    y=Acos(kx+ωt)y = A \cos(kx + \omega t)

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