A) $ 3\times 10^{8},Hz $
B) $ 3\times 10^{18},Hz $
C) $ 3\times 10^{10},Hz $
D) $ 3\times 10^{15},Hz $
Correct Answer: B
$ \nu ,=\frac{c}{\lambda }=\frac{3\times 10^{8}}{1\times {{10}^{-10}}}=3\times 10^{18}Hz $
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