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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
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Medium
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Understanding
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Statement 1: Electric and magnetic energy density in electromagnetic waves are equal.
Statement 2: Electromagnetic waves exert pressure on a surface.
Statement 2: Electromagnetic waves exert pressure on a surface.
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Correct option: B
Statement 1 is true & Statement 2 is true but is not correct explanation of Statement 1
Option B (Statement 1 is true & Statement 2 is true but is not correct explanation of Statement 1) is correct because both statements are individually true, but the pressure exerted by electromagnetic waves isn't a direct explanation for the equality of electric and magnetic energy densities.
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Statement I: Sound waves are not electromagnetic waves.
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
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