1.

Activity of radioactive element decreased to one third of original activity \[{{R}_{0}}\] in 9 years. After further 9 years, its activity will be                                                                    [DCE 2002]

A.            \[{{R}_{0}}\]                         
B.            \[\frac{2}{3}{{R}_{0}}\]
C.            \[{{R}_{0}}/9\]                     
D.            \[{{R}_{0}}/6\]
Answer» D.            \[{{R}_{0}}/6\]


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