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Question 10: NCERT Solutions for 12th Class Physics: Chapter 8-Electromagnetic Waves

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Question 10: NCERT Solutions for 12th Class Physics: Chapter 8-Electromagnetic Waves

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 Vm-1.
(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals the average energy density of the B field, [c = 3 × 108 m s-1.]

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  1. Solution:
    (a) Wavelength of electromagnetic wave is

    (b) Amplitude of magnetic field,

    (c) Energy density as electric field,

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 8-Electromagnetic Waves