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Find out the wavenumber, when an electron jumps from 2^nd orbit to 1^st.(a) 82357.75 cm^-1(b) 105,677 cm^-1(c) 82257.75 cm^-1(d) 109,677 cm^-1This question was addressed to me in a job interview.This key question is from Developments Leading to the Bohr’s Model of Atom topic in section Structure of Atom of Chemistry – Class 11

Answer»

Correct choice is (c) 82257.75 cm^-1

The best I can explain: The Swedish SPECTROSCOPIST, JOHANNES Rydberg gave a FORMULA; Wavenumber = RH[(1/n1)^2-(1/n2)^2]. Here RH is the Rydberg constant and is EQUAL to 109,677 cm^-1. Wavenumber = 109,677(3/4) = 82257.75 cm^-1.



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