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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
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Medium
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Understanding
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Which of the following statement is false for the properties of electromagnetic waves?
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Correct option: D
Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave
Option D (Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave) is false because electric and magnetic fields in an EM wave are perpendicular to each other.
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Statement I: Sound waves are not electromagnetic waves.
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Reason: The rest mass of photon is zero Intensity of electromagnetic wave will be The rms value of the electric field of the light coming from the Sun is . The average total energy density of the electromagnetic wave is Methane is a greenhouse gas because
Statement II: Sound waves require a material medium for propagation. For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field and magnetic field respectively? Assertion: The relative velocity of two photons travelling in opposite directions is the velocity of light.
Reason: The rest mass of photon is zero Intensity of electromagnetic wave will be The rms value of the electric field of the light coming from the Sun is . The average total energy density of the electromagnetic wave is Methane is a greenhouse gas because