Answer
(a) $3.34\times10^{14}\,s^{-1}$
(b) $6.79\times10^{14}\,s^{-1}$
(c) $6.10\times10^{9}\,s^{-1}$
(d) $6.59\times10^{18}\,s^{-1}$
Work Step by Step
(a) Frequency $\nu=\frac{c}{\lambda}$ where $c$ is the speed of light and $\lambda$ is the frequency.
That is, $\nu= \frac{3.00\times10^{8}m/s}{8973\times10^{-10}\,m}=3.34\times10^{14}\,s^{-1}$
(b) $\nu= \frac{3.00\times10^{8}m/s}{442\times10^{-9}\,m}=6.79\times10^{14}\,s^{-1}$
(c) $\nu= \frac{3.00\times10^{8}m/s}{4.92\times10^{-2}\,m}=6.10\times10^{9}\,s^{-1}$
(d) $\nu= \frac{3.00\times10^{8}m/s}{4.55\times10^{-9}\times10^{-2}\,m}=6.59\times10^{18}\,s^{-1}$
