Key Idea.
Section 1
The Atmosphere acts as a Filter
A filter is a material that uses selective absorption to separate a mixture of light. It transmits the wavelengths we want while blocking the ones we don't.
The Earth's atmosphere acts as a massive, gaseous filter wrapping the planet.
Section 2
Composition Determines Filtering
The effectiveness of a filter depends entirely on what it is made of. Specific gases, like ozone (), are required to absorb specific UV wavelengths.
If the composition of the atmosphere changes—for example, if the amount of ozone gas decreases—the filter changes. It will no longer block UV light as effectively.
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Section 1
The Atmosphere acts as a Filter
A filter is a material that uses selective absorption to separate a mixture of light. It transmits the wavelengths we want while blocking the ones we don't.
The Earth's atmosphere acts as a massive, gaseous filter wrapping the planet.
Section 2
Composition Determines Filtering
The effectiveness of a filter depends entirely on what it is made of. Specific gases, like ozone (), are required to absorb specific UV wavelengths.
If the composition of the atmosphere changes—for example, if the amount of ozone gas decreases—the filter changes. It will no longer block UV light as effectively.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter