The Big Bang theory states that a. all matter and energy in the Universe was once packed into a single point. b. the process of atom creation, termed Big Bang nucleosynthesis, produced all known natural elements. c. all of the possible answers are correct. d. temperatures had to remain above 1 billion degrees in order for atoms to form.

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.