1. Word cloud
120 seconds
What is heat radiation in simple terms?
2. Slide
60 seconds
Radiation is the transfer of heat energy via infrared waves. Radiation does not require a medium to travel through. Heat transfer by radiation is faster than heat transfer by conduction and convection.
Heat Transfer by Radiation
3. Slide
60 seconds
Emissivity: The measure of an object’s ability to release heat energy in the form of radiation. Absorptivity: The measure of an object’s ability to absorb heat energy in the form of radiation.
Concepts:
4. Slide
60 seconds
Heat transfer by radiation can occur through a vacuum, unlike conduction and convection which require a medium. The vast majority of the energy that reaches Earth's surface is from radiation. The amount of radiation emitted by an object is dependent on the temperature of the object, its surface area, and its emissivity. Hotter objects emit more heat energy by radiation.
Did you know?
5. Open question
300 seconds
What are some common examples of heat transfer by radiation?
6. Open question
300 seconds
What are some of the ways radiation can be used in everyday life?
7. Open question
300 seconds
What is the connection between radiation and temperature?
8. Slide
60 seconds
Radiation on a Surface
Rough surfaces absorb more thermal radiation. Dark surfaces absorb more thermal radiation. Shiny surfaces absorb less thermal radiation. Light surfaces absorb less thermal radiation.
9. Slide
60 seconds
Radiation from a Surface
Rough surfaces emit more thermal radiation. Dark surfaces emit more thermal radiation. Shiny surfaces emit less thermal radiation. Light surfaces emit thermal radiation.
10. Open question
300 seconds
How does the surface of an object affect radiation emission?
11. Drawings
450 seconds
Question: How does heat transfer by radiation work? Clues: • The transfer of energy by radiation requires no medium. • Radiation can travel through a vacuum or a solid. • Heat radiation is emitted from a hot object and absorbed by a cooler object. In pairs: Select and solve one of the tasks: A. Draw a diagram to illustrate how heat is transferred by radiation. B. Pair up with a classmate and explain your diagram to each other.
12. Poll
60 seconds
What is heat transfer by radiation?
- The transfer of heat through electromagnetic waves
- The transfer of heat through the movement of fluids
- The transfer of heat through direct contact between objects
13. Poll
60 seconds
Which statement describes radiation as a mode of heat transfer?
- It requires a medium to travel
- It can occur in a vacuum
- It only happens at high temperatures
14. Poll
60 seconds
Which material is the best absorber and emitter of thermal radiation?
- Transparent glass surfaces
- Black matte surfaces
- Polished silver surfaces
15. Poll
60 seconds
True or False: Radiation is the fastest mode of heat transfer.
- True
- False
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