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Questions  

For an atom of ion having single electron, the following wavelengths are observed. What is the value of missing wavelength x ?
 

a
20
b
40
c
60
d
120

detailed solution

Correct option is D

Applying Ritz combination principle, we get1λn3→n1=1λn3→n2+1λn2→n1 or 140=1x+160  or  1x=140−160 or x= 120mm

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