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Which one of the following frequencies of radiation (in $\mathrm{Hz}$ ) has a wavelength of $600 \mathrm{~nm} ?$
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The correct answer is:
$5.0 \times 10^{14}$
$\begin{aligned} v & =\frac{c}{\lambda} \\ & =\frac{3 \times 10^8}{600 \times 10^{-9}} \\ v & =5 \times 10^{14} \mathrm{~Hz}\end{aligned}$
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