Answer
$4.738\times10^{14}Hz$
Work Step by Step
λ = 632.8 nm = $632.8\times10^{-9}m$
c = $2.997925\times10^{8}ms^{-1}$
Frequency (ν) = c/λ = $\frac{2.997925\times10^{8}ms^{-1}}{632.8\times10^{-9}m}$ = $4.738\times10^{14}s^{-1}$
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