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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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Which of the following statements about electromagnetic waves is/are correct?
(1) X-rays in vacuum travel faster than light waves in vacuum.
(2) The energy of X-ray photon is greater than that of a light photon
(3) Light can be polarised but X-ray cannot.
(1) X-rays in vacuum travel faster than light waves in vacuum.
(2) The energy of X-ray photon is greater than that of a light photon
(3) Light can be polarised but X-ray cannot.
View answer and explanation
Correct option: D
2 only
Option D (2 only) is correct because X-rays and light waves travel at the same speed in a vacuum, and both can be polarized, but X-ray photons have higher energy than light photons.
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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