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Chemistry · Class 12
Atomic absorption spectroscopy (AAS) measures light absorbed by ground-state atoms at element-specific wavelengths — the reverse partner of emission. A hollow-cathode or element lamp shines through an atomised sample (flame/furnace); detector sees how much resonant light is missing. Each element has its own absorption fingerprint, so AAS is widely used for quantitative metal analysis in water, foo
PracticeAtomic emission spectroscopy excites atoms (flame, spark, discharge) so electrons jump up then fall back, emitting light at characteristic wavelengths — line (atomic) spectra. Continuous emission spectra (white light through a prism) show merged rainbow colours without sharp boundaries. Line spectra identify elements: Na yellow flame, Sr red, K violet; discharge tubes give Ne, He, etc. coloured gl
PracticeClassical combustion is limited to C/H/O formula work. Modern IR finds functional groups; UV-Vis finds conjugation/colour centres; NMR maps hydrogen environments; atomic methods quantify metals; MS gives mass and fragments. Forensic chemistry applies these tools to evidence for reports and courts — analysts need strong analytical background, attention to detail, and problem-solving. Practical scho