What is the maximum kinetic energy of an electron torn from lithium by irradiation with light if the photon energy is 2.8 eV?
| December 16, 2020 | education
What is the maximum kinetic energy of an electron torn from lithium by irradiation with light if the photon energy is 2.8 eV? The work function of an electron from the lithium surface is 2.4 eV.
Decision:
From the Einstein equation Eph = A + Ek
Ek = Eph-A = 2.8-2.4 = 0.4 eV = 0.4 * 1.6 * 10 ^ -19 = 0.64 * 10 ^ -19 J
Answer: 0.64 * 10 ^ -19 J
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