Answer
$5.5×10^{-8}m$
Work Step by Step
Using the relation λ = $\frac{c}{ν}$, where λ is the wavelength, c is the speed, and ν is the frequency, we get :
λ = $\frac{2.997925×10^{8}m/s}{5.5×10^{15}s^{-1}}$= $5.5\times10^{-8}m$
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