The energy required to ionize a single water molecule is 2.02 x 10^-18 J. What wavelength (in nm) photon would deliver this amount of energy?

Question

Quizplus · Accepted Answer

The energy of a photon is given by E = hc/λ, where h is Planck's constant (6.626 x 10^-34 J·s), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength. Solving for λ gives λ = hc/E. Substituting the given energy and constants, λ = (6.626 x 10^-34 J·s)(3.00 x 10^8 m/s) / (2.02 x 10^-18 J) = 98.4 nm.

The Energy Required to Ionize a Single Water Molecule Is