Question

Consider the Carbon isotope 15 6C ½ . a) what does each of these numbers indicate: 15: __________________ 6: __________________ 9: ______________ ½ : _____________ is it a boson or a fermion? ______________ b) What is wrong with this nucleus? __________________________ to become more stable, it emits a { alpha | beta | gamma | neutron | positron | proton } that carries 9.9 MeV of Energy. Write the complete reaction, including pre-script numbers: c) Suppose you have a large sample of these Carbon isotopes. At time t=0, they emit 1600 projectiles/second, … but only 200/s emitted at t=7.5s. Compute C-15’s half-life, its mean (expected) lifetime, and the likelihood decay rate. d) How many C-15 isotopes did you start with at t=0?

Answer 1