Question

Cobalt-60 is a radioactive isotope used to treat cancers. A gamma ray emitted by this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602 multiplied by 10-19 J). What is the frequency (in Hz) and the wavelength (in m) of this gamma ray?

Answer 1

Convert 1.33 MeV to J, then
E = hc/wavelength to find wavelength and
c = frequency*wavelength to find frequency.