How Much Energy Does a Single Photon of an Argon

Multiple Choice

How much energy does a single photon of an argon ion laser emit if the wavelength of this photon is 489 nm?

A) 4.06×10 ^{- 19} J
B) 9.74×10 ^{- 23} J
C) 4.06×10 ^{- 28} J
D) 9.74×10 ^{- 32} J
E) None of these