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15 Cards in this Set
- Front
- Back
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What is the electromagnetic spectrum |
Microwaves Infrared radiation Radio waves |
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What are electromagnetic waves |
Electric and magnetic waves that travel through space |
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Infrared waves are shorter in wavelength than visible light waves. True or false? |
False |
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What do all objects emit |
Infrared radiation which is why people use it to see people in the dark. |
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What has temperature got to do with infrared radiation? |
Higher temperature= more infrared radition that is emitted in a given time |
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Can objects absorb infrared radiation? |
Yep, a body of constant temperature absorbs as much as it emits |
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Whats a black body |
An object that can absorb radiation without reflecting it and no radiation passes through it. |
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What can good absorbers also be? |
Good emitters |
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What does a perfect black body emitting radiation called |
Perfect black body radiation |
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What is the rule between temperature and wavelengths |
An object that has a constant temperature emits radiation across a continuous range or wavelengths |
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What happens when the temperature of the object increases? |
The intensity of the radiation it emits is greater at every wavelength |
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Describe what this graph is telling us and shows |
The graph shows that as trmperature of an object increases, so does the intensity of the radiation. The peak of the higher radiation curve lasts for a shorter wavelength than the peak of the lower curve |
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Explain the 2 peaks of the wavelengths |
The reason why the shorter intensity wavelength has a longer wavelength at its peak than the wavelength with the higher intensity is because the shorter the wavelengths the more increase in intendity at the wavelength This concludes that peak intensity is at a shorter wavelength than it was at the lower temperature |
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What the bloody hell is infrared radiation |
Basically Its a type of Electromagnetic radiation involving waves which is emotted from a hot object
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Black body |
Absorbs all the radiation and emits it all so its the best absorber and emitter |
