a. Alpha-particles of energy 5.0 MeV are emitted in the radioactive decay of radium. Express this energy in joules.
b. Electrons in an cathode-ray tube are accelerated through a potential difference of 10 kV. Calculate their energy:
i. In electronvolts
ii. In joules.
c. In a nuclear reactor, neutrons are slowed to energies of 6 × 10⁻²¹ J. Calculates this in eV.