In order to answer this question we will use the Energy formula, but we will find the wavelength through this formula, the formula is:
E = hc/λ
where:
E = energy in joules, 4.125*10^-19
h = Planck's constant, 6.626*10^-34
c = the speed of light, which is also a constant, 2.998*10^8
λ = is the wavelength
We will make the arrangements to find wavelength
λ = hc/E
Now let's add our values to the formula
λ = (6.626*10^-34) * (2.998*10^8)/4.125*10^-19
λ = 4.81*10^-7
1 nanometer is equal to 1*10^-9 meters
Therefore we have 481 nanometers