CAPE Physics Unit 2 · 2007 · Paper 1 · Question Q33

A work function of a metal is the

1. (A)cut-off wavelength of electro-magnetic radiation for that metal, above which no photoelectrons are emitted
2. (B)minimum energy of electro-magnetic radiation needed for a photoelectron to be produced from the metal
3. (C)threshold frequency of electro-magnetic radiation required, below which no photoelectrons are emitted from the metal
4. (D)the maximum kinetic energy of photoelectrons emitted from the metal surface when electro-magnetic radiation of a given frequency is used