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CBSE Class 12-science Answered

use rydberg formula to determine the wavelenth of Halpha line given R=1.03x10 7 per metre?
Asked by vasturushi | 28 Feb, 2018, 02:00: AM
answered-by-expert Expert Answer
Hα line belongs to balmer series.
Balmer formula is : begin mathsize 12px style 1 over lambda equals R open parentheses 1 over 2 squared space minus space 1 over n squared close parentheses end style, where R is rydberg constant
For Hα line n = 3, hence begin mathsize 12px style 1 over lambda equals space 1.03 cross times 10 to the power of 7 cross times open parentheses 1 over 2 squared minus 1 over 3 squared close parentheses space equals 1.431 cross times 10 to the power of 6 space m to the power of negative 1 end exponent end style
hence λ = 699 nm
Answered by Thiyagarajan K | 28 Feb, 2018, 02:26: PM

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