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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.
### 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
- [IB Physics Data Booklet](/resources/g11/ib-physics-data-booklet.pdf)