Answer
c) 8.70$\times10^{2}$ nm.
Work Step by Step
λ= c/ν = $\frac{3.00\times10^{8}ms^{-1}}{3.45\times10^{14}s^{-1}} = 8.70\times10^{-7} m = 8.70\times10^{2} nm$.
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