Red light of frequency #4.37 x 10^14# Hz is required to excite a certain electron. What energy did the electron gain from the light?

1 Answer
Dec 1, 2016

Use the relationship between the energy of the photon and its frequency: #E = h nu#

#h# is Planck's constant


The energy gained by the electron is equal to the difference in energies of the final and initial states, which must be equal to the energy of the photon that was absorbed (in order to conserve the overall energy of the system).

#E = h nu = (6.626 times 10^(-34) Js)(4.37 times 10^14 s^(-1))#

#E=2.90 times 10^-19 J#