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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
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The frequency of a plane electromagnetic wave traveling in vacuum in X-direction is
30 MHz, its wavelength is
30 MHz, its wavelength is
View answer and explanation
Correct option: C
10 m
Option C (10 m) is correct because the wavelength is calculated using the formula , where c is the speed of light and f is the frequency.
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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
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