Photons from a source each have energy 3.30 eV. Photons from a second source have double the frequency of those from the first source. What is the energy of a photon from the second source? 

a) 6.60 eV 

b) 13.2 eV 

c) 1.65 eV 

d) 0.825 eV 

e) 3.96 eV