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It has different wavelengths

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Ophelia Schroeder

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2y ago
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9y ago

Electromagnetic waves have a wide range of frequencies; some of those are visible for human eyes (visible light), some are not (radio waves, infrared, ultraviolet, x-rays, ...). Our eyes are simply designed to detect only part of this range. And it so happens that the energy emitted by the Sun has a wider range - including infrared and ultraviolet light.

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6y ago

UV radiation has a shorter wavelength (10 nm to 400 nm) than visible light (~390-750 nm).

Light is absorbed by matter based partly on how the wavelength corresponds to the natural vibrational frequencies of the molecules of the matter. Air is generally rather transparent to visible light but any ozone in the atmosphere absorbs a lot of UV radiation because its frequency corresponds to the vibrational frequency of the bonds in the ozone molecule. UV rays are generally better for sterilizing things than visible light because the wavelength gets absorbed by living matter and can selectively break the bonds common in bacteria and viruses. This is also the reason that UV rays can cause melanin to darken, cause sunburns, and damage the skin leading to skin cancers. Visible light is the wrong wavelength to get absorbed by these bonds and does not have this effect.

Note: there is a little bit of overlap between visible violet light and ultraviolet radiation from 390nm to 400 nm.

Note: shorter wavelength corresponds to higher frequency

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6y ago

it travels at different speed through spaces

Both visible and non-visible energy from the sun are electromagnetic waves of energy. They differ in in frequency (and wavelength). The portion visible to the human eye is only a small range of frequencies surrounded by both higher and lower frequencies that are not visible to the human eye. Other animals may be able to see a narrower, wider or different frequency range that humans can not see.

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14y ago

the change in the wavelength is what causes the change in color in visible light

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10y ago

It has different wavelengths

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Q: How is sunlight composed of energy that is visble to humans and energy that is not visble to humans?
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