A line in the spectrum of atomic hydrogen has a wavelength of 410 nm. When hydrogen emits a photon of light at this wavelength, the frequency of this light is: 

a) 8.54 x 10^-16 S-1 

b) 7.31 x 10^14 S-1 

c) 1.17 x 10^15 S-1 

d) 1.37  10^-15 S-1 

e) 123 s-1