Answer
$5.71\times10^{14}\,Hz$
Work Step by Step
Frequency $\nu=\frac{c}{\lambda}$ where $c$ is the speed of light and $\lambda$ is the wavelength.
$\nu=\frac{3.00\times10^{8}\,m/s}{525\times10^{-9}\,m}=5.71\times10^{14}\,Hz$
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