7. measuring instruments to absorb light (UV-VIS Spectrophotometer) Figure 7 meter to absorb light.UV-VIS Spectrophotometer measuring tool to suck the light of light wavelength range 190-800 nm UV-VIS Spectrophotometer was used extensively in the laboratory to determine the quantity of inorganic compounds in the samples, such as nitrite, ammonia, etc. by measuring light suck of colored compounds against a standard solution.5.1 nature of light.Light is an electromagnetic wave (electromagnetic wave) are light speed in vacuum is equal to the product of the wavelength (nm), and frequency (frequency), but traveling speed will change to when travelling through other intermediaries with travel speed is equal to 10 x 16-2.9979 cm/sec/n (n =. The index of refraction, refractive index medium) There are different types of light wavelength and moving with different speeds.The intensity of the reflected light is measured in the unit are candle (candle power) or lumens (lumen) The quantity varies directly with the light intensity (intensity) of light, so the light intensity measurement is a measurement of the amount of indirect light. Wavelength is reflected light rather than with a green font kakhue λ (lambda, lambda) Light each range of wavelength is named differently according to the requirements of the Joint Committee on Nomenclature in Applied Spectroscopy as follows (Shu and Prem's, 2525 (1982))Visible light (visible light) as the white light that is caused by a combination of the primary colors and light are 7 blue color is purple, blue, green, yellow, Orange and red colors with wavelength ranging from. 400-700 nm, when white was affecting the object and see what color the object indicates that the object a different light but absorb all visible light reflection from the eye color. But if they suck all light, the color will be visible to all the object is black, light-violet lotra (ultraviolet light) with wavelength ranging from 210-380 nm light is qualified to make the electrons of the atoms was passed (electronic transmission) when the body is this prolonged exposure can cause hazard fire scorched skin, for example. Eye ball lining is damaged and can cause skin cancer, because light-violet lotra makes thai-nabet (thymine base) for nucleus of cells assembled.Infrared light (infrared light), is the light that is not visible with the naked eye. Can cause the molecules of different objects, severe vibrations occurred until the heat up so much, because most objects absorb light in the wavelength range in the range 3000-100000 nm better and therefore used IR radiation to make various objects dry as effective in drying than conventional heat usage. Figure 8 electromagnetic waves.5.2 rules of absorb light.5.2.1 the rules of Lambert (r. 1760) said the light was suck directly proportional to the thickness of a medium light.It = I0 x 10-kt -----------------------(1)
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