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A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance expressed in day is

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A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance expressed in day is

(a) 2.5

(b) 5

(c) 10

(d) 20

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The correct option is  (c) 10.

Explanation:

Activity of radioactive substance, 

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