Physics-
General
Easy

Question

The rms value of the electric field of the light coming from the sun is 720 N/C The average total energy density of the electromagnetic wave is

  1. 3.3 cross times 10 to the power of negative 3 end exponent J divided by m to the power of 3 end exponent    
  2. 4.58 cross times 10 to the power of negative 6 end exponent J divided by m to the power of 3 end exponent    
  3. 6.37 cross times 10 to the power of negative 9 end exponent J divided by m to the power of 3 end exponent    
  4. 81.35 cross times 10 to the power of negative 12 end exponent J divided by m to the power of 3 end exponent    

The correct answer is: 4.58 cross times 10 to the power of negative 6 end exponent J divided by m to the power of 3 end exponent

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If blank to the power of n P subscript r equals 720 comma to the power of n C subscript r equals 120  then (n,r) is

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