So, after time-independent 1D Schrodinger equation is solved, this is obtained E = n2π2ħ2/(2mL2) This means that the mass of the 'particle' is inversely related to the energy eigenvalue. Does this mean that the actual energy of the particle is inversely related to its mass? Isn't this counter intuitive? Doesn't E = mc2? Put in another way, what does E mean in the first equation? Is the eigenvalue of energy different than our classical notion of energy?