1. a Which process of thermal energy transfer is responsible for the transfer of energy between stars and planets, such as the Earth, and their surroundings?
2. b The amount of energy radiated by a hot body depends on four factors. State the four factors.
3. c State the Stefan–Boltzmann law for a radiating body.
4. d
i What is meant by the term *black body*?
ii How does a real body differ from a black body?
iii How is the term *emissivity* defined?