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
(a) 2 hour           (b) 1 hour
(c) $\frac{1}{2}$ hour         (d) $\frac{1}{4}\mathrm{hour}$

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