What is the amplitude of the electric filed in a parallel beam of light intensity \(\left(\frac{15}{\pi}\right) \frac{\text{W}}{\text{m}^2} \left(\right. \text{Assume}\left.\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9 \frac{\text{Nm}^2}{\text{C}^2}\right)\)
1
60 N/C
2
50 N/C
3
40 N/C
4
30 N/C