A sodium vapor lamp emits light photons with a wavelength of 4.8 x 10⁻⁷ m. What is the radiation energy of the light photons?
a) 4.17 x 10⁻¹⁹ J
b) 4.17 x 10⁻²⁰ J
c) 4.17 x 10⁻²¹ J
d) 4.17 x 10⁻²² J