What is the frequency of a blue light photon with a wavelength of 480 nm?

6.25 × 10^14 Hz

In this case, the velocity of light is 2.998 × 10^8 m/s

Wavelength = 480 nm

But; 1 nm = 10^-9 M

Therefore,

480 nm = 4.8 × 10^-7 M

Rearranging the formula;

Frequency = Velocity ÷ wavelength

                  = (2.998 × 10^8 m/s) ÷ 4.8 × 10^-7 m)

                  =  6.246 × 10^14 Hz

                 = 6.25× 10^14 Hz

Therefore, the frequency of the blue light photon is 6.25 × 10^14 Hz