1. The problem statement, all variables and given/known data could you help me for the question b? 2. Relevant equations E = mc^2 3. The attempt at a solution the mass of the alpha particle is 0.66466 x 10^-26 kg >> 4.022 u put it into the equation, so E = 4.022 x c x c = 3.615 x 10^17 eV >> 0.0579 joule my answer is that, but my teacher answer is 1.89x10^-13 joule.. which one is true? can you show me where's my wrong?