CAPE Physics Unit 2 · 2012 · Paper 1 · Question Q33

In an experiment investigating the photoelectric emissions from a metal, the stopping potential was found to be 3.0\text{ V} when light of frequency 7.5 \times 10^{14}\text{ Hz} was used. What is the work function of the metal?

1. (A)5.0 \times 10^{-19}\text{ J}
2. (B)9.8 \times 10^{-19}\text{ J}
3. (C)3.3 \times 10^{-20}\text{ J}
4. (D)1.7 \times 10^{-20}\text{ J}