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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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Arrange the following electromagnetic radiations per quantum in the order of increasing energy.
A. Blue light
B. Yellow light
C. X-ray
D. Radio wave
A. Blue light
B. Yellow light
C. X-ray
D. Radio wave
View answer and explanation
Correct option: A
D, B, A, C
Option A is correct. Energy is inversely proportional to wavelength, and the order of increasing energy is Radio wave < Yellow light < Blue light < X-ray.
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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