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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
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Analyzing
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Statement I: Displacement current decreases with the increase in frequency of a.c. supplied to the capacitor
Statement II: Reactance due to capacitance is directly proprtional to the frequency of a.c.
Statement II: Reactance due to capacitance is directly proprtional to the frequency of a.c.
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Correct option: B
Statement I is true; statement II is false
Option B (Statement I is true; statement II is false) is correct because displacement current decreases with frequency, and capacitive reactance is inversely proportional to frequency.
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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