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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
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A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then average pressure exerted on the surface is ( speed of light)
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Correct option: C
2E/Atc
Option C (2E/Atc) is correct because the average pressure exerted is twice the energy divided by the area, time, and speed of light, accounting for perfect reflection.
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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