The energy of a photon is given by [tex]E=hf[/tex] where [tex]h=6.6 \cdot 10^{-34} Js[/tex] is the Planck constant f is the frequency of the photon
In our problem, the frequency of the light is [tex]f=5.49 \cdot 10^{14}Hz[/tex] therefore we can use the previous equation to calculate the energy of each photon of the green light emitted by the lamp: [tex]E=hf=(6.6 \cdot 10^{-34}Js)(5.49 \cdot 10^{14} Hz)=3.62 \cdot 10^{-19} J[/tex]
