A) may emit another photon in the Paschen series
B) need not emit any more photon
C) may emit another photon in the Balmer series
D) must emit another photon in the Lyman series.
Correct Answer: D
Solution :
The S.I. unit of radioactivity is Curie or disintegration/sec. \[1\,\text{Curie}=3.7\times {{10}^{10}}dis/\sec \]
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