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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
Wavelength and penetration
Wavelength and penetration
Wavelength and penetration
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Wavelength and penetration. | Physics Forums

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. It only takes a minute to sign up. Some background - Some recent research has strongly suggested that UVA penetration into the skin is far more dangerous than UVB, a very good example is this paper by Agar et al.
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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.
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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. I'd like you to clarify the relationship which relates penetration power by EM radiation with its wavelength or inverse of frequency. Suppose we conduct an experiment, irradiating a body with different wavelengths but keeping the amount of power per surface unit constant so I reckon we have to reduce the power by the emitter as we shorten the wavelength, correct me if I'm wrong.
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