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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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The amplitude of an electromagnetic wave in vacuum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is true?
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Correct option: D
None of the above
Option D (None of the above) is correct because the speed, frequency, and wavelength of an electromagnetic wave in a vacuum are independent of its amplitude.
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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