The wavelengths of visible electromagnetic radiation are in the range of 400 nm to 780 nm. What is the maximum

The wavelengths of visible electromagnetic radiation are in the range of 400 nm to 780 nm. What is the maximum momentum of a photon of visible radiation?

Photon energy E:
E = hv = hc / λ,
where h is Planck’s constant,
v – frequency,
c is the speed of light,
λ is the wavelength.
The mass m is put into the dependence of the energy E:
E = mc2.
Having a velocity c and a mass m, a photon has a momentum p = mc.
E = mc * c = pc;
Comparing the energy expressed in terms of wavelength and momentum leads to the relationship:
hc / λ = pc;
p = h / λ = 6.62 × 10-34 J * s / 4 × 10-7 m = 1.65 × 10-27 kg * m / s;
Answer: 1.65 * 10-27 kg * m / s.