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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size where is the wavelength of the wave in free space. The phenomenon, which happens there will be:
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Correct option: D
Scattering
Option D is correct because when the object size is much smaller than the wavelength, scattering occurs.
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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