Wavelength and penetration
Use Advanced Search to search by activities, standards, and more. Visible sunlight makes up about 40 percent of the total energy Earth receives from the sun. The rest of the energy Earth receives from the sun is not visible. About 50 percent is infrared energy, nine percent is ultraviolet UV energy, and one percent is X-rays or microwaves. Electromagnetic radiation is made up of electromagnetic waves that are defined by their wavelength and frequency. Of the entire electromagnetic spectrum, the human eye can view only a small portion of electromagnetic waves in the form of light.
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Wavelength and penetration. | Physics Forums
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Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. When electromagnetic radiation is incident on the surface of a material, it may be partly reflected from that surface and there will be a field containing energy transmitted into the material. This electromagnetic field interacts with the atoms and electrons inside the material. Depending on the nature of the material, the electromagnetic field might travel very far into the material, or may die out very quickly. For a given material, penetration depth will generally be a function of wavelength.