Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (Physics only) Do only perfect black bodies (objects) emit radiation?
   • All bodies (objects) emit radiation.
2. (HT only) (Physics only) What is happening in terms of radiation and emission when a body is at a constant temperature?
   • (HT only)A body at constant temperature is absorbing radiation at the same rate as it is emitting radiation.
3. (Physics only) At what temperature do all bodies (objects) emit and absorb infrared radiation?
   • All bodies (objects), no matter what temperature, emit and absorb infrared radiation.
4. (Physics only) What is the relationship between temperature and radiation of infrared radiation?
   • The hotter the body, the more infrared radiation it radiates in a given time
5. (Physics only) What colour object would be the best absorbed and emitter of radiation?
   • Since a good absorber is also a good emitter, a perfect black body (object) would be the best possible emitter.
6. (Physics only) What factors affect the intensity and wavelength distribution of emissions from a body (object)?
   • The intensity and wavelength distribution of any emission depends on the temperature of the body.
7. (Physics only) What is a perfect black body (object)?
   • A perfect black body is an object that absorbs all of the radiation incident on it. A black body does not reflect or transmit any radiation.
8. (HT only) (Physics only) What happens when the temperature of a body (object) increases?
   • (HT only)The temperature of a body increases when the body absorbs radiation faster than it emits radiation.
9. (HT only) (Physics only) What factors can affect the temperature of the Earth?
   • (HT only) The temperature of the Earth depends on many factors including: the rates of absorption and emission of radiation, reflection of radiation into space.
10. (HT only) (Physics only) Give an example of when the balance between incoming radiation absorbed and radiation emitted results in a constant temperature of a body (object)
    • (HT only) The constant temperature of the Earth.
11. (HT only) (Physics only) What affect to the temperature of the Earth's atmosphere would an increase in radiation absorbed have?
    • (HT only) If the amount of radiation absorbed by the Earth's atmosphere was to increase, the overall temperature of the Earth would also increase.