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Emission and Absorption Spectra
Emission and Absorption Spectra - One can understand atomic spectra if one knows the concept of atomic energy levels. The movements of electrons from one level to another causes the spectra. The work of a spectoscopicst is to find the energy levels of an atom from the measured v..
Emission Spectra
When light emitted from a source is examined directly in a spectroscope, we observe the emission spectrum of the source. When continuous light from a source is made to pass through an absorbing substance and then examined in a spectroscope, we obtain the absorption ..
Atomic absorption spectra
When the atomic vapours from a sample are placed in the path of white light from an arc lamp, it absorbs the light of certain characteristic wavelengths and the light of other wavelengths get transmitted. In such conditions a series of dark lines on a white background are formed. This is called an..
When the atomic vapours from a sample are placed in the path of white light from an arc lamp, it absorbs the light of certain characteristic wavelengths and the light of other wavelengths get transmitted. In such conditions a series of dark lines on a white background are formed. This is called an..Atomic spectra of hydrogen atom
) by a mathematical relation, which was later modified by Rydberg. where 'R H ' is the Rydberg's constant and 'n 1 ', 'n 2 ' are integers with values equal to or greater than 3 and ' l ' is the wavelengt..
) by a mathematical relation, which was later modified by Rydberg. where 'R H ' is the Rydberg's constant and 'n 1 ', 'n 2 ' are integers with values equal to or greater than 3 and ' l ' is the wavelengt..Photosynthetic Pigments
Photosynthetic Pigments - Molecules of chlorophyll-a, chlorophyll-b, carotene and xanthopyhll are situated in the thylakoid membranes. For light energy to be used by living systems, it must first be absorbed. A pigment is any substance that absorbs light. Chlorophyll, the pigment that makes leaves ..
Photosynthetic Pigments - Molecules of chlorophyll-a, chlorophyll-b, carotene and xanthopyhll are situated in the thylakoid membranes. For light energy to be used by living systems, it must first be absorbed. A pigment is any substance that absorbs light. Chlorophyll, the pigment that makes leaves ..Atoms and Nuclei Conclusion
Conclusion - Rutherford's alpha particle scattering experiment explained the structure of atom and the size of nucleus. The Bohr's model explained the hydrogen spectrum. Radioactivity occurs due to nuclei being unstable resulting in the emission of three types of radia..
How a Laser Works
How a Laser Works - The below figure shows schematically how a population inversion can be achieved so that laser action-or lasing us it is called can occur. Atoms from the ground state E 1 are "pumped" up to an excited state E 3 , for example by the absorption of light energy from an int..
How a Laser Works - The below figure shows schematically how a population inversion can be achieved so that laser action-or lasing us it is called can occur. Atoms from the ground state E 1 are "pumped" up to an excited state E 3 , for example by the absorption of light energy from an int..Summary (Contd…)
Two main types of spectra are: - Emission spectrum - Absorption spectrum The emission spectrum is further of three types: - Continuous emission spectrum, which contains all the wavelengths in a particular region. ..
Spontaneous and Stimulated Radiation
Spontaneous Emission..
Spontaneous Emission..Lasers-An Introduction
Lasers-An Introduction - The laser is an acronym for Light Amplification by Stimulated Emission of Radiation. The laser has been invented and developed in 1959 and 1960. In the laser, the maser principle has been extended to optical or visible light frequencies of 10 1 4 to 10 1 5 cycle/s..
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