Radiation travels in straight lines: True
Radiation can travel through a vacuum: True
Radiation requires particles to travel: False
Radiation travels at the speed of light: True

1. Which of the following is not a method of heat transfer?
Insulator

2. In which of the following are the particles closest together?
Solid

3. How does heat energy reach the Earth from the Sun?
Radiation

4. Which is the best surface for reflecting heat radiation?
Shiny white

5. Which is the best surface for absorbing heat radiation?
Dull black