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11.2.Radiation pattern:

Type of Radiation Frequency Range (Hz) Wavelength Range

gamma-rays 10% 10° 107m
xrays 10° 10 Lom | pe
wltraviolet 107 10° 400 am 1 om
visible 4x10'¢ 7 Sk10* 750 nm 400 an:
near-infrared 1610 4x10 28pm 750m
infrared 107 10 25pm 2 Sum
microwaves 3x10" 107 Deen 2S um
radio waves < 3x10 le

1.1.3Prnciple of Emission Spectroscopy

The eramsson spectrum 1s peotaced by the erussion of radusnt energy by a excried som can de
brought out thermally oe ebecincally

1 ehoctrn duicharpe 1s passed through vapors of smbstince. energy 1s shored and ehoctrons
round iste sre promoted 1 mets stsble ste When they [arp from higher energy stste to
Tower energy site. some energy 1s rebessed in the form of raisons. [f thas radistion 1s sealyred
WAR pec trOncopac echAX{oes. the ETL IO §NCIrUR 1s Observed

Fxample When ekectrons of sodiars
eatistron of yellow flare 1s observed When electrons jamp from hy
emery bevel (ort

excrted 10 hg

emerpy stute with the help of flare. 5

nergy level 10 lower

5 wavelength us erated. this phenomenon 1 called emission

1.1.4-Prnciple of Absorption Spectroscopy

If ehectromagnetsc radiations sre passed
eatistrons of certan wavelength se sorbed by the substisce [n cue of molecules

hough 3 substance under snadyus foe some ime

wavekength which are shuorbed sre became of some partials faschonsd groups present in the
compound The ps he wavelength shorted 1s called

sorption spectra [1 w sued foe both qualitative sad quastiiaive sly

on of dark lines whack correspond to

1.2. Flame photometry
12.1: Introduction
Flare erussion spectrometry also known x Mise photorsetry Flare phosorsetry was used

aeterrain ston of the alkalies ad otder essily excried ehersents A swedish
sgrosoeaust mame | anDeganth discovered flame photometry

extensively foe

wn 1920 He used pees st

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Maria Zia

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Chemistry Tutor

Learning and Understanding Chemistry.

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Learning and Understanding Chemistry

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