An Argon-Ion Laser Emits a Blue-Green Beam of Light with a Wavelength

Multiple Choice

An argon-ion laser emits a blue-green beam of light with a wavelength of 514.5 nm in a vacuum. What is the difference in energy in joules between the two energy states for the atomic transition that produces this light?

A) 6.08 × 10^-19 J
B) 1.05 × 10^-20 J
C) 5.18 × 10^-19 J
D) 3.86 × 10^-19 J
E) 4.10 × 10^-20 J