7. measuring instruments to absorb light (UV-VIS Spectrophotometer) Figure 7 absorb light meterUV-VIS Spectrophotometer measuring tool to suck the light wavelength range of 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 the light of compounds that absorb color against a standard solution.5.1 nature of light.Light is electromagnetic waves (electromagnetic wave) vacuum speed of light is equal to the product of the wavelength (nm), and frequency (frequency), the travel speed will change to when travelling through other intermediaries with travel speed is equal to x 10-16 cm/2.9979 sec/n (n = 0. Index refraction, refractive index of the medium). Different types of light, it will have a different wavelength and moving with different speeds.The intensity of the reflected light is measured in candle (candle power) or lumens (lumen). The quantity varies directly with the light intensity (intensity) of the light, so the measure of the intensity of the light is a measurement of the amount of indirect light. Wavelength of light reflected by the Green kakhue letter λ (lambda, lambda). Each wavelength of light is set to be named differently according to the requirements of the Joint Committee on Nomenclature in Applied Spectroscopy: (Shu and Prem, 2525 (1982))Visible light (visible light) as the white light that is caused by a combination of various colors are light color is purple 7 blue, blue, green, yellow, Orange and Red wavelength from. 400-700 nm light affects object fall when white and make visible the object which indicates that an object is a light but absorb different colors, reflective eyes out. But if they absorb light, all colors are visible, objects have a black light (ultraviolet light) UMA lotra violet has a wavelength from 380 nm 210-a light that has the ability to make the electrons of the atom has passed (electronic transmission) when the body is this prolonged exposure may cause dangerous fires scorched skin, for example. Child eye lining is damaged and can cause skin cancer due to exposure, Udon thai lotra violet cause overheating nabet (thymine base) in the nucleus of the cell.Infrared (infrared light) light is light that is not visible with the naked eye. Can cause the molecules of objects vibrations occur, severe heat warming up because most objects absorb light in the wavelength range in the range 3000-100000 nm. thus used infrared to dry objects, because effective drying of heat consumption is higher than normal? Figure 8 electromagnetic waves.5.2 rules of absorb light.5.2.1 the rules of Lambert (1760), said that the light is directly absorb in proportion to the thickness of a medium light.
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