CAPE Physics Unit 2 · 2009 · Paper 1 · Question Q33

A metal surface has a work function of 3.8\text{ eV}. The threshold wavelength for this metal is

1. (A)6.08 \times 10^{-19}\text{ m}
2. (B)1.09 \times 10^{-15}\text{ m}
3. (C)3.27 \times 10^{-7}\text{ m}
4. (D)9.17 \times 10^{14}\text{ m}