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JEE Main 2006
Exam
JEE Main
Year
2006
Subject
Physics
Chapter
Electromagnetic Waves

JEE Main 2006 · Physics · Electromagnetic Waves

The rms value of the electric field of the light coming from the...

The rms value of the electric field of the light coming from the Sun is 720 N/C720 \mathrm{~N} / \mathrm{C}. The average total energy density of the electromagnetic wave is

Options

  1. A3.3×10−3 J/m33.3 \times 10^{-3} \mathrm{~J} / \mathrm{m}^3
  2. B4.58×10−6 J/m34.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3
  3. C6.37×10−9 J/m36.37 \times 10^{-9} \mathrm{~J} / \mathrm{m}^3
  4. D81.35×10−12 J/m381.35 \times 10^{-12} \mathrm{~J} / \mathrm{m}^3

Correct answer

B. 4.58×10−6 J/m34.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3

Step-by-step solution

U_{a v}=\varepsilon_0 E_{\text{rs }^2=4.58 \times 10^{-6} \mathrm{ J} /m3\mathrm{m}^3E_{rms \text{rms } }=4.58 \times 10^{-6} J\mathrm{ J} / m3\mathrm{m}^3
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