1.

In above question, calculate the longest wavelength produced :

Answer»

18800 Å
9800Å
12400Å
8800Å

Solution :For longest wavelength, we CONSIDER n=4 to n=3
`hv=E_(0) [1/3^(2)-1/4^(2)]`
`(HC)/(lambda)=E_(0) [1/9-1/(16)]=E_(0) (7)/(144)`
Then `lambda=18800 Å`


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