A) \[38.8\,N{{C}^{-1}}\]
B) \[48.3\,N{{C}^{-1}}\]
C) \[50.2\,N{{C}^{-1}}\]
D) \[68.8\,N{{C}^{-1}}\]
Correct Answer: A
Solution :
[a] Intersity of a plane electromagnetic wave \[=\frac{1}{2}{{\varepsilon }_{0}}E_{0}^{2}c\], so \[E=\sqrt{\frac{2I}{{{\varepsilon }_{0}}c}}=38.8\,N{{C}^{-1}}\]
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