What is the ground state energy of the following. (a) an electron Well the formula is: E_n = (h^2/(8*m*L^2))*n^2; The ground state means, n = 1, its the lowest enegery level possible. So i plugged in n = 1, mass of e = 9.11E-31; h = 4.136E-15 eVs; L = 100 pm, because the book says thats tabout the size of a typical atom. I ended up getting: E_1 = 2.347E20 eV which was wrong, any ideas why? They really don't tell me what value i should give L, so i'm guessing thats where i screwed up maybe? In the book it says the electron is in an infintie well. thanks!