Chapter 4, Problem 4P

The gamma rays emitted by ${}^{\text{6}0}\text{Co}$ are used in radiation treatment of cancer. They have a frequency of $\text{2}.\text{83}\times \text{1}{0}^{\text{2}0}{\text{ s}}^{-\text{1}}$ . Calculate their wavelength, expressing your answer in meters and in angstroms.