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The r.m.s. value of the electric field of the light coming from the sun is 720 NC-1. The average total energy density of the electromagnetic wave is
  • 3.3 × 10-3 Jm-3 
  • 4.58 × 10-6 Jm-3
  • 6.37 × 10-9 Jm-3  
  • 81.35 × 10-12 Jm-3

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