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Writepostulatesof Bohr.smodelofhydrogenatom |
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Answer» Solution :Nells Bohr (1913) was the firstto explainquqntitatively thegeneralfeaturesof hydrogenatomstructure andtisspectrum. Pitulatesof model: (i) Theelectron is the HYDROGENATOM can movearoundthenucleusin acircularpathcalledorbitsstationarystatesor allowedenergystates. Theseorbitsare arrangestconcentrically aroundthe nucleus. (ii) The energyof anelectronin the ORBIT doesnot changewith timeHowever the electron willmovefroma lowerstationarystateto ahigherstationarystatewhenrequiredor ENERGYIS emitted whenelectronmovesdoesnottakeplace in acontinuouschange (iii) The frequency of radiationabsorbedoremitted whentransitionoccursbetweentwostationarystatesthatdifferin energyby Where`E_(1)`and `E_(2)`are the energies of lowerand higherallowedenergystatesrespectivelythisexpressionis commonlyknown asbohrfrequencyrule Thusanelectroncan move only in thoseorbitsfor whichitsangularmomentumisintegralmultiple of `((h)/( 2pi))` that iswhyonlycertain fixedorbitsare ALLOWED. |
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