1.

In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half-life of the sample         [Kerala PMT 2005]

A.            \[\frac{1}{4}\]                      
B.            \[\frac{1}{2\sqrt{2}}\]
C.            \[\frac{1}{\sqrt{2}}\]        
D.            \[2\sqrt{2}\]
Answer» D.            \[2\sqrt{2}\]


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