A) 3
B) 3.88
C) 2.5
D) 3.2
E) 2.8
Correct Answer: A
Solution :
For an electromagnetic wave (in vacuum), Velocity \[c=\frac{1}{\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}}=3\times {{10}^{8}}m{{s}^{-1}}\] Air acts almost as vacuum, hence \[a=3(approx)\]
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