{"id":9042,"date":"2020-03-13T13:18:01","date_gmt":"2020-03-13T13:18:01","guid":{"rendered":"https:\/\/www.experimentoscientificos.es\/?page_id=9042"},"modified":"2020-04-03T10:31:28","modified_gmt":"2020-04-03T10:31:28","slug":"espectro-luz-visible","status":"publish","type":"page","link":"https:\/\/www.experimentoscientificos.es\/en\/espectro-electromagnetico\/espectro-luz-visible\/","title":{"rendered":"Visible Light Spectrum"},"content":{"rendered":"

The visible light spectrum is the region of the electromagnetic spectrum<\/a> that the eye is capable of perceiving. There are no exact limits on the visible spectrum: the typical human eye will respond to\u00a0wavelengths from 380 to 750 nm<\/strong>although in exceptional cases, some people may be able to perceive wavelengths from 310 to 1050 nm<\/strong>.<\/p>\n

\"ESPECTRO<\/p>\n

At wavelengths below 400nm we encounter the ultraviolet light<\/strong> and at wavelengths longer than 700nm we have the infrared<\/strong>.<\/p>\n

By visible light we refer to the light that reaches us from the sun (sunlight) as well as the artificial light generated. We differentiate between the two spectra because they are different (the solar spectrum has other areas of the electromagnetic spectrum in addition to visible light).<\/p>\n

SOLAR LIGHT<\/strong><\/p>\n

The sun is a source of electromagnetic waves reaching the earth, most of which are in the visible light spectrum. The following figure shows the distribution of the waves arriving from the sun. Approximately 56% correspond to visible light, but waves with wavelengths shorter than ultraviolet and wavelengths longer than infrared are also received.<\/p>\n

\"\"<\/p>\n

What we know as light is the dispersion<\/strong> of electromagnetic waves of visible light made by air molecules.<\/p>\n

Polarisation of light. Polarised light<\/p>\n

The flame from a candle, a Bunsen burner or one of those lighters used by all the
\nThe students are also surprised to see that the
\nflame does not cast any shadow on the wall (figures 18a and 18b). It can be explained as follows
\nis the photosphere, transparent to almost all radiation.<\/p>\n

INCANDESCENT LIGHT<\/strong><\/p>\n

ULTRAVIOLET LIGHT<\/strong><\/p>\n

Depending on their wavelength, several subtypes of ultraviolet rays can be distinguished:<\/sup><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Name<\/th>\nAbbreviation<\/th>\nWavelength (nm)<\/th>\nEnergy per photon (eV)<\/th>\n<\/tr>\n<\/thead>\n
Ultraviolet A (long wave)<\/td>\nUVA<\/td>\n400 - 315<\/td>\n3,10 - 3,94<\/td>\n<\/tr>\n
Ultraviolet B (medium wave)<\/td>\nUVB<\/td>\n315 - 280<\/td>\n3,94 - 4,43<\/td>\n<\/tr>\n
Ultraviolet C (shortwave)<\/td>\nUVC<\/td>\n280 - 100<\/td>\n4,43 - 12,40<\/td>\n<\/tr>\n
Near Ultraviolet\u00a0(near)<\/i><\/td>\nNUV<\/td>\n400 - 300<\/td>\n3,10 - 4,13<\/td>\n<\/tr>\n
Medium ultraviolet\u00a0(middle)<\/i><\/td>\nMUV<\/td>\n300 - 200<\/td>\n4,13 - 6,20<\/td>\n<\/tr>\n
Far ultraviolet\u00a0(far)<\/i><\/td>\nFUV<\/td>\n200 - 122<\/td>\n6,20 - 10,16<\/td>\n<\/tr>\n
Lyman-alpha line<\/td>\nH Lyman-\u03b1 \/ Ly-\u03b1<\/td>\n122 - 121<\/td>\n10,16 - 10,25<\/td>\n<\/tr>\n
Vacuum ultraviolet<\/td>\nVUV<\/td>\n200 - 10<\/td>\n6,20 - 124<\/td>\n<\/tr>\n
Extreme ultraviolet<\/td>\nEUV<\/td>\n121 - 10<\/td>\n10,25 - 124<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Most of the ultraviolet radiation reaching the Earth from the Sun is in the forms UV-A, UV-B and UV-C; UV-C radiation does not reach the surface as it is absorbed by oxygen and ozone in the atmosphere; UV-B radiation is partially absorbed by ozone and only reaches the Earth's surface to a minimal extent, so that the radiation reaching the Earth's surface is mainly of the UV-A type.<\/p>\n

The types of UV radiation (A, B and C) are related to the damage they cause to humans: UV-C radiation is the most damaging to life.<\/p>\n

Moderate absorption of UV-B ultraviolet rays allows the synthesis of vitamin D in the skin, which is necessary for the absorption of calcium and its deposition in the bones.<\/sup><\/p>\n

RELATED EXPERIMENTS<\/h2>\n
\n
\n\n\n
\n<\/div>\n
\n
\n\n

Optical Prism<\/a><\/h3><\/div>\n\n<\/strong> Isaac Newton demonstrated the composition of white light as a sum of all colours with a glass prism, known today as Newton's prism.<\/div>\n\n<\/div>\n
<\/div>\n<\/div>\n
<\/div>\n\n\n<\/div>","protected":false},"excerpt":{"rendered":"

The visible light spectrum is the region of the electromagnetic spectrum that the eye is capable of perceiving. There are no exact limits to the visible spectrum: the typical human eye will respond to wavelengths from 380 to 750 nm, although in exceptional cases some people may be able to perceive wavelengths from 310 to 1050 nm. In [...]<\/p>","protected":false},"author":1,"featured_media":9043,"parent":9039,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"acf":[],"yoast_head":"\nEspectro Luz Visible<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.experimentoscientificos.es\/en\/espectro-electromagnetico\/espectro-luz-visible\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Espectro Luz Visible\" \/>\n<meta property=\"og:description\" content=\"El espectro de luz visible es la regi\u00f3n del espectro electromagn\u00e9tico que el ojo es capaz de percibir.\u00a0No hay l\u00edmites exactos en el espectro visible: el ojo humano t\u00edpico responder\u00e1 a\u00a0longitudes de onda\u00a0de 380 a 750\u00a0nm, aunque en casos excepcionales algunas personas pueden ser capaces de percibir longitudes de onda desde 310 hasta 1050\u00a0nm. 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