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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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Statement I: Sound waves are not electromagnetic waves.
Statement II: Sound waves require a material medium for propagation.
Statement II: Sound waves require a material medium for propagation.
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Correct option: A
Statement I and statement II are true
Option A (Statement I and statement II are true) is correct because sound waves are mechanical waves (not electromagnetic) and require a medium to propagate.
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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 The correct expression in accordance with Gauss’s law for magnetism is