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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Understanding
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Which of the following is/are the property/properties of a monochromatic electromagnetic wave propagating in the free space?
I. Electric and magnetic fields will have a phase difference .
II. The energy of the wave is distributed equally between electric and magnetic fields.
III. The pressure exerted by the wave is the product of its speed and energy density.
IV. The speed of the wave is equal to the ratio of the magnetic field to the electric field.
I. Electric and magnetic fields will have a phase difference .
II. The energy of the wave is distributed equally between electric and magnetic fields.
III. The pressure exerted by the wave is the product of its speed and energy density.
IV. The speed of the wave is equal to the ratio of the magnetic field to the electric field.
View answer and explanation
Correct option: B
Only II
Option B is correct because only statement II is true: the energy of an electromagnetic wave is equally distributed between electric and magnetic fields.
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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