Em Waves Question 131
Question: The amplitude of the electric field if the intensity of a plane electromagnetic wave is given as $ 2.0,W{{m}^{-2}} $ is
Options:
A) $ 38.8,N{{C}^{-1}} $
B) $ 48.3,N{{C}^{-1}} $
C) $ 50.2,N{{C}^{-1}} $
D) $ 68.8,N{{C}^{-1}} $
Show Answer
Answer:
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}} $
BETA
