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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
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Electromagnetic energy is radiated by:
(a) Stationary charge
(b) A charge in uniform motion
(c) An accelerated charge only
(d) An accelerated charge and a charge in uniform motion
Choose the correct statement.
(a) Stationary charge
(b) A charge in uniform motion
(c) An accelerated charge only
(d) An accelerated charge and a charge in uniform motion
Choose the correct statement.
View answer and explanation
Correct option: C
(c) only
Option C ((c) only) is correct because only an accelerated charge radiates electromagnetic energy.
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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