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phys: add ghg resonance

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eggy 2021-04-14 14:06:28 -04:00
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@ -480,6 +480,10 @@ $$\alpha=\frac{\text{energy scattered/reflected}}{\text{energy absorbed}}$$
Greenhouse gases are responsible for remaining increases in temperature. By absorbing and then re-emittng their natural frequencies of electromagnetic radiation (infrared for greenhouse gases), they delay the release of radiation back into space and heat up the atmosphere. Greenhouse gases are responsible for remaining increases in temperature. By absorbing and then re-emittng their natural frequencies of electromagnetic radiation (infrared for greenhouse gases), they delay the release of radiation back into space and heat up the atmosphere.
### Radiation absorption by greenhouse gases
All molecules have a natural frequency at which they absorb radiation from the electromagnetic spectrum and **resonate** at. The natural frequency of greenhouse gases is in the infrared region, which is what the Earth re-emits solar radiation as. Therefore, greenhouse gases absorb this radiation and them re-emit it in all directions, "trapping" some of the radiation. Resonance is also the phenomenon responsible for the protection from ultraviolet radiation by the ozone layer.
## Resources ## Resources
- [IB Physics Data Booklet](/resources/g11/ib-physics-data-booklet.pdf) - [IB Physics Data Booklet](/resources/g11/ib-physics-data-booklet.pdf)