the energy of an n state can be given by: E = (nh)^2 / 8mL^2 is this a representation of the Kinetic energy of the particle? i thought it was but this question has got me confused. it asks for the Energy of the n=1 state, which ive done. then it asks what quantum number, n would be needed if the Kinetic Energy was 0.025eV. i rearranged the above eqn for n and put E= (0.025ev X 1.6x10^-19 ), but get something stupid as a result. so, is E the energy of the state of the particle OR it's kinetic energy OR both? Thanks in advance for any help.