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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
1 of 1
Understanding
+4 | -1
Assertion: In electromagnetic waves electric field and magnetic field lines are perpendicular to each other.
Reason: E and B are self - sustaining
Reason: E and B are self - sustaining
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Correct option: B
If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
The correct answer is B (If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion) because both statements are true, but the self-sustaining nature of E and B doesn't directly explain their perpendicularity.
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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