1. According to Rutherford and soddy's law of Beta emission:
[tex] {K}^{42} \: ---> {Ca}^{40} + {2e}^{0} [/tex]
3. According to Rutherford and soddy's law of Alpha emission:
[tex]{U}^{238} \: ---> {Th}^{234} + {He}^{4} [/tex]
4. The process in which two or more light nuclei are combined to form a single nucleus with the release of tremendous amount of energy is called a nuclear fusion. The inner core of Sun is at very high temperature and is suitable for fusion. In fact the source of energy of Sun and other stars is nuclear fusion reactions.
