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Q.

The half life period of a radioactive substance is 60 days. The time taken for 78th of its original mass to disintegrate will be :

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a

180 days

b

130 days

c

120 days

d

20 days

answer is C.

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Detailed Solution

∵ N=N0tT1/2⇒2tT1/2=N0N=N0N08⇒ 2tT1/2=23⇒ t=3×T1/2=3×60 days=180 days 

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