Physics Modern Physics Level: High School

Dual Nature

Gold has a work function W of 4.9 eV .

a) What is the minimum frequency of photon needed to observe the photoelectric effect ?

b) If illuminated by ultraviolet radiation of frequency 2.3 x 10^15 Hz what is the K.E in Joules of the emitted electron ?

c) What is the energy in electron volts ?