1.

16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is                                  [MP PMT 1994]

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


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