Energy levels A,B,C of a certain atoms c...

Energy levels A,B,C of a certain atoms corresponding to increasing values of energy level i.e., `E_(A) lt E_(B) lt E_(C)`. If `lambda_(1), lambda_(2)` and `lambda_(3)` are the wavelengths of radiations corresponding to the transitions C to B,B to A and C to A respectively which of the following statement is correct?

`lambda_(3)=lambda_(1)+lambda_(2)`

`lambda_(3)=(lambda_(1)lambda_(2))/(lambda_(1)+lambda_(2))`

`lambda_(3)=sqrt(lambda_(1)lambda_(2))`

`lambda_(3)=sqrt(lambda_(1)^(2)+lambda_(2)^(2))`

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