1.

Energy levels A, B and C of a certain atom correspond to increasing values of energy 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 Cto B, B to A and C to A respectively as shown in Fig. 12.04, then which of the following statement is correct?

Answer»

`lambda_(3)= lambda_(1) + lambda_(2)`
`(1)/(lambda_(3)) = (1)/(lambda_(1))+ (1)/(lambda_(2))`
`lambda_(1) + lambda_(2) + lambda_(3) = 0`
`lambda_(3)^(2)= lambda_(1)^(2) + lambda_(2)^(2)`

Solution :Here ` E_(B) - E_(A)= (hc)/(lambda_(1)) , E_(c) - E_(B) = (hc)/(lambda_(1))and E_(C) = E_(A) = (hc)/(lambda_(3))`
On simplyfingtheseequestions weget THERELATION ` (1)/(lambda_(3)) =(1)/(lambda_(1))+(1)/(lambda_(2))`


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