Answer
$8.904\times 10^{14}s^{-1}$
Work Step by Step
We know that
$\nu=\frac{E}{h}$
We plug in the known values to obtain:
$\nu=\frac{5.90\times 10^{-19}}{6.626\times 10^{-34}}=8.904\times 10^{14}s^{-1}$
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