1. The problem statement, all variables and given/known data A simplified E versus k curve for an electron in the conduction band is given. the value of a is 10 Å. Determine the relative effective mass m* / m0. 2. Relevant equations m* = ħ2 / (d2E /dk2) m0 = 9.11 E-31kg 3. The attempt at a solution The second derivative must be constant.