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Due to transitions among its first three energy levels, hydrogenic atom emits radiation at three discrete wavelengths `lamda_(1), lamda_(2), " and " lamda_(3) (lamda_(1) lt lamda_(2) lt lamda_(3))`. Then

A

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

B

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

C

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

D

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

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The correct Answer is:
D
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