What is a 'perfect black body'?
A perfect black body is an object that absorbs all of the radiation falling upon it.
A perfect black body does not reflect or transmit any radiation.
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Is a black body a good or bad emitter of radiation?
A perfect black body is the best possible emitter.
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Explain how temperature affects the amount of infrared radiation a body (object) emits and absorbs.
All bodies emit and absorb radiation. Hotter objects emit more radiation.
Temperature does not affect how much infrared radiation is absorbed.
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Explain why hot objects cool down, in terms of emission/absorption of infrared radiation.
Hot objects emit more infrared radiation than they absorb.
This means that their total thermal energy will decrease, causing them to cool down.
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How does the temperature of an object affect the wavelength of radiation it emits?
As the temperature of an object increases, the wavelength of radiation emitted by the object decreases.
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What does intensity mean, in terms of infrared radiation?
Intensity is a measure of the power of the radiation, per unit area. So a higher intensity means more radiation is emitted.
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