An electromagnetic wave of frequency 1 × 10 14 hertz is pro…

Physics Electromagnetic Wave General MCQ (Single Correct)

An electromagnetic wave of frequency 1 × 10 14 hertz is propagating along z–axis. The amplitude of electric field is 4V/m. If ∈ 0 = 8.8 × 10 –12 C 2 /N–m 2 , then average energy density of electric field will be :

35.2 × 10 –11 J/m 3

35.2 × 10 –12 J/m 3

35.2 × 10 –13 J/m 3

35.2 × 10 –10 J/m 3

Text Solution

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The correct answer is:

u = ∈ 0 E 2 rms = × 8.8 × 10 –12 × = 35.2 × 10 –12

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