Help with this pls <3

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

Which element below could be and isotope of this atom