What is the energy of a photon of light with a wavelength of 3.10 × 10−7 m?

E = hf = hc/λ
= (6.6 x 10^-34) × (3 × 10^8) ÷ (3.1 × 10^-7)
=6.138 × 10^-32 J

The first choice. Because an electrical current can also be used to separate water into its components of oxygen and hydrogen. ... A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power.