1. The problem statement, all variables and given/known data An alpha particle of energy 5.78 MeV is emitted from a particular nucleus. Calculate the de Broglie wavelength of the alpha particle. How does it compare with the nuclear diameter, which is known to be approximately 2x10−14 m. 2. Relevant equations E=h/p and E=hf 3. The attempt at a solution I was thinking of using E=hc/lamda but this would be wrong because alpha particles don't travel at c.