Across
- 2. The unit of energy (J)
- 4. A perfect _____ ____ absorbs all the radiation that hits it (5,4).
- 7. Defines how quickly a material can transfer heat (6,12).
- 9. Energy divided by time (it is measured in Watts)
- 11. Heat reaches the earth from the sun by ________
Down
- 1. The energy needed to change the temperature of 1kg by 1 degree. (8,4,8)
- 3. They generate electricity from sunlight (5,6)
- 5. Thermal Conduction is the transfer of ____ through a material.
- 6. Infrared radiation is part of the ______________ spectrum.
- 8. The unit of time.
- 10. Thermal insulation reduces this (4,4)