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# Calculate the wave number of lines having the frequency of $5 \times 10^{16}$ cycles per sec

$\begin{array}{1 1} (a)\;1.666 \times 10^8\;m^{-1} \\(b)\;2.666 \times 10^8\;m^{-1}\\ (c)\;0.666 \times 10^8\;m^{-1}\\ (d)\;3.666 \times 10^8\;m^{-1}\end{array}$

Given $c= 3 \times 10^8 m/sec$
$u= 5 \times 10^{16}\;cycles /sec$
$\bar{u}= 1.666 \times 10^8\;m^{-1}$