Suppose that you meet anti-you (yourself but made of antimatter: antiprotons, positrons, etc. When you two shake hands, your entire bodies will undergo matter-antimatter annihilation; converting your entire masses to energy. Suppose your mass is 100 kilograms. What is the energy of the resulting explosion in Joules?
The following three problems (3-5 concern stars Alpha and Beta. In all three problems, Alpha has an apparent brightness that is 100 times larger than Beta.