Answer
$3\times10^{7}s^{-1}$
Work Step by Step
λ = 10m
c = $2.997925\times10^{8}ms^{-1}$
ν = c/λ = $\frac{2.997925\times10^{8}ms^{-1}}{10m}$ = $3\times10^{7}s^{-1}$
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