If a sinusoidal electromagnetic wave with intensity 18 W/m2 has an electric field of amplitude E, then a 36 W/m2 wave of the same wavelength will have an electric field of amplitude? a. 4E
b. 2 underroot 2E
c. 2E
d. underroot E

The  correct option is D

Explanation:

From the question we are told that

  The intensity of the first  electromagnetic wave is  

  The amplitude of the electric field is  

   The intensity of the second electromagnetic wave is  

Generally the an electromagnetic wave intensity is mathematically represented as

Looking at this equation we see that

=>  

=>  

=>          

=>          

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