1. If the mass less during a nuclear reaction is 14 micro grams. How much energy is realised? 2. Calculate the maximum KE and velocity of an electron ejected from zinc by a 275nm photon. Table 12.1 Work Functions of Some Common Metals Work function Metal (eVi aluminum 4.28 calcium 2.87 cesium 2.14 copper 4.65 iron 4.50 lead 4.25 lithium 2.90 nickel 5.15 platinum 5.65 potassium 2.30 tin 4.42 tungsten 4.55 zinc 4.33