5.08 Thermal Radiation

2. The greater the surface ________ of an object, the more heat it radiates.
4. The best emitter and absorber of heat is a matt _________ surface.
6. Heat from the sun can reach us through __________________ waves that does not require a medium.
8. The best reflector of heat is a _____________ and shiny surface.
9. The inner walls of a vacuum flask has silvery surfaces to _________ thermal radiation.
11. A black frying pan is a better ________ of heat radiation than a shiny one as it get heated up faster.
12. Most thermal flasks have an insulated ________ to reduce conduction and convection.

1. The greater the _____________ of an object, the more heat it radiates.
3. The _________ flask is able to keep drinks hot or cold for hours as it has a double-walled container with air removed.
5. The _____________ effect happens when heat radiation comes through a glass or plastic panel house and heats up the objects inside and causes the thermal energy to be trapped.
6. A black teapot cools down faster than a white one as it is a better __________ of heat radiation.
7. The process of heat transfer mainly through ___________ waves is known as thermal radiation.
10. Some houses have _______ panels on their roofs which are used to heat up water for hot water system.