Verified answer

your frequency should have a power around 10^15

speed of light should have a power of 10^8

so wavelength = v/f = 2.998 x 10^8/ 5.1 x 10^15 = approx 6 x 10^-7 m ( I'll let you work it out exactly

What do your strange symbols mean? Ê? §?

And what is an "emission ray"?

The following equation is what you want, I think:

λf = c = 2.998e8 m/s (speed of light in vacuum)

λ = Wavelength in meters

f = frequency in Hz

deez nutzzzz