The work function W of a metal specifies the minimum energy needed to remove an electron from that metal, and is often expressed as an energy per mole of electrons. For cesium=206 kJ mol^-1
1. A sample of Cs is irradiated with blue light. Are electrons ejected?
2. A sample of Cs is irradiated with light of wavelength 2.95x 10^-7 m, and electrons are ejected. What is the speed, in ms^-1, of these electrons?