Pls I need answers to this 4 questions thanks

1. J.J. Thomson's experiment showed that Select one: A. Most of the mass of an atom is in the nucleus. B. electrons have both wave and particle characteristics. C. electrons have both charge and mass. D. electron's are in energy levels in an atom. 2. What causes an emission line spectrum of a hot gas? Select one: A. Atoms losing electrons. B. Atoms gaining electrons. C. Electrons moving to a lower energy level. D. Electrons moving to a higher energy level. 3. The sun produces a full spectrum of light. What does this tell us about the sun? A. The sun produces light by a nuclear reaction. B. The sun's most common element is hydrogen. C . The sun emits x rays. D. The sun has a solid core. 4. Which equation below explains why there is a slight decrease in mass in a nuclear reaction? Select one: A. E=hf B. E=mc2 c. W=hfo D. N=No(1/2)n