A radioactive sample has a certain number N of unstable nucleithat are emitting 4.5 MeV gamma rays with a half-life of 1.5 hours.If the rate of radioactive heating of the sample due to thesedecays is 13 watts, how many unstable nuclei are initially in thesample?
AND
A muon at rest decays into an electron, an anti-electronneutrino, and a muon neutrino. After the decay, the electron has atotal energy of 52.85 MeV and the anti-electron neutrino has anenergy of 20 MeV. What is the energy of the muon neutrino (in MeV,closest answer)?
AND
*Suppose that a particle of mass m is confined to a region ofwidth a. Its energy in the ground state must be of order (theparticle is non-relativistic)–
(1) \bar{h} ^2/(ma^2 ). (2) 2 eV. (3) \bar{h} /a. (4) \bar{h} ^2*am. (5) \bar{h} ^2/(ma).
*(don't truly comprehend this last one specially-thanks.)
