PHY131s17, Homework #10: Beam of Light A beam of ultraviolet radiation, with fre

Question

PHY131s17, Homework #10: Beam of Light A beam of ultraviolet radiation, with frequency of 15 Hz is directed on a clean metal surface. The work function of the metal is 3.40 eV. Calculate the maximum kinetic energy for an electron dislodged from the surface by the radiation. 3.29eV First you have to calculate the energy of the photons (uv radiation) from the frequency and then use the conservation of energy for the incoming photon, workfunction and outgoing electron. Submit Answer Incorrect. Tries 1/20 Previous Tries

Explanation / Answer

Photoelectric equation
hv = + 0.5 m( v(max))2
photon energy = work function + max KE
KE (max) = hv -
KE (max) = 6.6x10-34x2.640x1015 - 3.40x1.6*10-19 (Joule)
KE (max) = 17.42x10-19 - 5.44x10-19
KE (max) = 11.98x10-19 Joule

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