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Q.

Half life of a radio active element is 1200 yrs. It m0 gm of radio active element existing now, m0/4 gm will remain radio active after

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a

600 years

b

4800 years

c

2400 years

d

2800 years

answer is C.

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Detailed Solution

NN0=1(2)t/T⇒m0/4m0=1(2)t/T⇒1(2)2=1(2)t/T⇒t/T=2⇒t=2×1200 years = 2400 years
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