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Three energy levels P,Q,R of a certain a...

Three energy levels P,Q,R of a certain atom are such that `E_(P)ltE_(Q)ltE_(R)`. If` lambda_(1),lambda_(2) and lambda_(3)` are the wave length of radiation to transition `RtoQ , QtoP` and `Rto P ` respectively . The correct relationship between `lambda_(1),lambda_(2) and,lambda_(3)` is

A

`lamda _(1) + lamda_(2) = lamda_(3)`

B

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

C

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

D

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

Text Solution

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The correct Answer is:
B
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