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Botany

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20 Jan 2009 16:25:12 IST

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what is absorption spectra???

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what is absorption spectra???

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Rohit Khattar

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20 Jan 2009 17:30:13 IST

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when white light is passed thorugh atoms of an element and then analysed by a analyser we find some dark patches in the spetrum obtained as the atoms absorb light of certain wavelengths...hope it helps...

edison

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20 Jan 2009 21:05:52 IST

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Absorption spectroscopy refers to a range of techniques employing the interaction of electromagnetic radiation with matter. (Spectroscopy is a word that has come to denote an even wider variety of techniques used in physics and chemistry.) In absorption spectroscopy, the intensity of a beam of light measured before and after interaction with a sample is compared. When combined with the word spectroscopy, the words transmission and remission refer to the direction of travel of the beam measured after absorption to that before. The descriptions of the experimental arrangement usually assume that there is a unique direction of light incident upon the sample, and that a plane perpendicular to this direction passes through the sample. Light that is scattered from the sample toward a detector on the opposite side of the sample is said to be detected in transmission and treated according to the theory of transmission spectroscopy. Light that is scattered from the sample toward a detector on the same side of the sample is said to be detected in remission and it is this light that is the subject of remission spectroscopy. The remitted radiation may be composed of two kinds of radiation referred to as specular reflection (when the angle of reflection is equal to the angle of incidence) and diffuse reflection (at all other angles).

edison

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20 Jan 2009 21:08:12 IST

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Optical absorption of crystals is performed by Spectrophotometer ti identify the absorption wavelenght and thus types of impurities and defects located in the crystal.

vignesh the cooler version of newton

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21 Jan 2009 19:31:40 IST

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hey.. i accept all the answers above..but here, i guess the quesn is about that of chlorophyll...it is the same as they have said above..only thing is that chlorophyll is used...and different wavelength of lights are incided on it...the productivity and rate of anabolic reactions are studied..it gives us a lot of info...like.. if we see the absorption spectra, there are at least two peaks which are visible easily..it tells us that two types of pigment systems are present... and all...

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