Energy in QM

1. Jun 20, 2007

alik

What is the difference between formulas E=p^2/2m and E= hf ?

2. Jun 20, 2007

jordi

You cannot understand a formula without its context. The first E in reality means: Energy of a non-relativistic, non-interacting, classical particle. The second E refers to the energy of a non-interacting, quantum photon.

3. Jun 20, 2007

mjsd

p^2/2m is non-relativistic kinetic energy
E=hf usually means total energy of a photon