Answer
$5.4\times 10^{18}s^{-1}$
Work Step by Step
We know that
$R=\frac{P}{E_U}$
We plug in the known values to obtain:
$R=\frac{150\times 10^6W}{173eV}(\frac{eV}{1.6\times 10^{-19}J})$
$R=5.4\times 10^{18}s^{-1}$
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