Simply put, ultraviolet radiation also known as UV radiation or ultraviolet rays is a form of energy traveling through space. Some of the most frequently recognized types of energy are heat and light. These, along with others, can be classified as a phenomenon known as electromagnetic radiation.
Other types of electromagnetic radiation are gamma rays, X-rays, visible light , infrared rays, and radio waves. The progression of electromagnetic radiation through space can be visualized in different ways. Some experiments suggest that these rays travel in the form of waves. A physicist can actually measure the length of those waves simply called their wavelength.
It turns out that a smaller wavelength means more energy. At other times, it is more plausible to describe electromagnetic radiation as being contained and traveling in little packets, called photons. The distinguishing factor among the different types of electromagnetic radiation is their energy content. Ultraviolet radiation is more energetic than visible radiation and therefore has a shorter wavelength.
To be more specific: Ultraviolet rays have a wavelength between approximately nanometers and nanometers whereas visible radiation includes wavelengths between and nanometers. The sun is a major source of ultraviolet rays.
Man-made lamps can also emit UV radiation, and are often used for experimental purposes. Light enables us to see, and heat keeps us from being cold. However, ultraviolet rays often carry the unfortunate circumstance of containing too much energy.
Some of the wavelengths of solar radiation traveling through the atmosphere may be lost because they are absorbed by various gases. Oxygen, carbon dioxide, and water vapor also filter out some wavelengths. Different parts of the Earth receive different amounts of solar radiation. Which part of the planet receives the most insolation?
Different areas also receive different amounts of sunlight in different seasons. What causes the seasons? The Earth revolves around the Sun once each year and spins on its axis of rotation once each day. This axis of rotation is tilted Understanding just how big solar flares can get.
Solar eclipse Prepare for a "ring of fire" on June Ask Astro : What will happen to Earth when the Sun dies? The Beginning to the End of the Universe : Our solar system's origin. What will happen to the planets when the Sun becomes a red giant? Cosmos: Origin and Fate of the Universe. Astronomy's Moon Globe. Galaxies by David Eicher. Astronomy Puzzles. Jon Lomberg Milky Way Posters.
Astronomy for Kids. Upon reaching the atmosphere, part of it gets absorbed and part of it passes through. Naturally, the ones that get absorbed add to the heat already there. The presence of greenhouse gases make the atmosphere absorb more heat, reducing the fraction of outbound EM waves that pass through.
Known as the greenhouse effect, this is the reason why heat can build up some more. The Earth is not the only planet that experiences the greenhouse effect.
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