Electromagnetic Radiation with a Wavelength of 531 Nm Appears as Green

Multiple Choice

Electromagnetic radiation with a wavelength of 531 nm appears as green light to the human eye. The energy of one photon of this light is 3.74 × 10^{- 19} J. Thus, a laser that emits 1.3 × 10^{- 2} J of energy in a pulse of light at this wavelength produces photons in each pulse.

A) 9.2 × 10^{- 24}
B) 2.9 × 10^{- 17}
C) 6.5 × 10¹³
D) 1.8 × 10¹⁹
E) 3.5 × 10¹⁶