Answer
$f = 8.57\times 10^{18}~s^{-1}$
Work Step by Step
We can find the frequency:
$f~\lambda = c$
$f = \frac{c}{\lambda}$
$f = \frac{3.0\times 10^8~m/s}{35.0\times 10^{-12}~m}$
$f = 8.57\times 10^{18}~s^{-1}$
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