NEET Class neet Answered
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
Asked by akshadevdm2020 | 22 May, 2021, 15:43: PM
Wavelength
of spectral line that arises due to transition from orbital quantum number m to orbital quantum number n is given as
![begin mathsize 14px style lambda subscript m n end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/13c3f8f412e7e986629aa59878cedb20.png)
![begin mathsize 14px style 1 over lambda subscript m n end subscript space equals space R space open parentheses 1 over m squared space minus space 1 over n squared close parentheses end style](https://images.topperlearning.com/topper/tinymce/cache/6d0ca6ca4a03f832272dcebbb421b89e.png)
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 Thiyagarajan K | 22 May, 2021, 16:56: PM
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