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# In which of the following transition the wavelength be minimum ? a)n=5 to n=4 b)n=4 to n=3 c)n=3 to n=2 d)n=2 to n=1

Wavelength of spectral line that arises due to transition from orbital quantum number m to orbital quantum number n is given as where R is Rydberg constant .

Reciprocal of wavelength for all the transitions are tabulated below

 Transition Eqn. for (1/λ) 1/λ n=5 to n=4 R × 0.0225 n = 4 to n = 3 R × 0.0486 n = 3 to n = 2 R × 0.1389 n = 2 to n = 1 R × 0.5

From above table , it can be seen that for the transition from n=2 to n=1 , Reciprocal of wavelength is maximum.

Hence wavelength is minimum for transition from n=2  to n=1
Answered by Expert 22nd May 2021, 4:56 PM
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