What is the wavelength in nanometers of a photon with a frequency of 6.10 ✕ 10^14 sec-1? (The speed of light in a vacuum is 2.998 ✕ 108 m/s. Planck's constant is 6.626 ✕ 10^-34 J·s.)

Question

I know that speed of light = wavelength * velocity, but I don't know what the velocity is. I don't need the answers necessarily, just an explanation please

Answer 1

I believe you are confused with the formula.
speed of light = frequency x wavelength
3E8 m/s = 6.10E14*wavelength