Question

Calculate the wave-number of lines having the frequency of $5\times 10^{16}$ cycles per $\sec$. Give your answer as multiple of $10^{-8}$.

Answer 1

Answer: 1.67

Given $c=3\times 10^{8}m/\sec$
$v=5\times 10^{16}$ cycles $/\sec$
$=$ ?
We know that
$\overline{v}=\frac{v}{c}=\frac{5\times 10^{16}}{3\times 10^8}$
$=1.666\times 10^8{m}^{-1}$