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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
1 of 1
Analyzing
+4 | -1
Assertion: The relative velocity of two photons travelling in opposite directions is the velocity of light.
Reason: The rest mass of photon is zero
Reason: The rest mass of photon is zero
View answer and explanation
Correct option: B
If both assertion and reason are true, but reason is not correct explanation of the assertion.
Option B is correct because while both the assertion and reason are true, the zero rest mass of a photon doesn't explain why their relative velocity is c.
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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? 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 The correct expression in accordance with Gauss’s law for magnetism is