12N undergoes a two-step nuclear reaction before producing stable 12C. The two-step process including one B*-decay and one y-decay in the order. It can be expressed as 1ZN->13C* ->13C and the emitted y-ray has an energy of 4.43 MeV. The atomic mass of

12N is 12.018613u.

(a) Calculate the binding energy per nucleon (in Me) of the nuclei 14N and 136, respectively.

(4 marks)

1. ????Explain why 12N is radioactive?
2. ????Write down the corresponding two step nuclear reactions.

(3 marks)

(4 marks)

(d) Claculate the maximum kinetic energy of the emitted positron.

(5 marks)

Express the values to 3 significant figures, if necessary.

C3. 12N undergoes a two-step nuclear reaction before producing stable C. The two-step process including one B+-decay and one y-decay in the order. It can be expressed as 12N-12C*=>12C and the emitted y-ray has an energy of 4.43 MeV. The atomic mass of 12N is 12.018613u. (a) Calculate the binding energy per nucleon (in MeV) of the nuclei 12N and 12C, respectively. (4 marks) (b) Explain why 12N is radioactive? (3 marks) (c) Write down the corresponding two step nuclear reactions. (4 marks) (d) Claculate the maximum kinetic energy of the emitted positron. (5 marks) Express the values to 3 significant figures, if necessary