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Effect Name, Work Function and Kinetic Energy Calculation

Ultraviolet radiation incident on a zinc plate releases electrons from the zinc surface. The energy of each incident proton is 5.4eV. Zinc has a work function of 4.3eV.

(i) State the name given to this effect.
(ii) What is meant by work function of the metal?
(iii) An electron is emitted from the surface of zinc. Calculate the maximum kinetic energy of the electron in Joules.

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(0 Ratings)

(i) Photoelectric effect
(ii) It is the minimum energy required to release an electron from the surface of that metal.

(iii) = 5.4 eV x (1.602 x 10-19 J ⁄ eV)
= 8.653 x 10-19 J
= (8.653 x 10-19 J) - (4.3 eV x 1.602 x 10-19 J ⁄ eV)
= (8.653 - 6.866) x 10-19 J
= 1.787 x 10-19 J

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October 05, 2023

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