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87.5% of a radioactive substance disintegrates in 40 minutes. What is the half life of the substance–

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87.5% of a radioactive substance disintegrates in 40 minutes. What is the half life of the substance–

(a) 13.58 min 

(b) 135.8 min 

(c) 1358 min 

(d) None

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1 Answer

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Correct Option  (a) 13.58 min 

Explanation: 

Determination K by substituting the respective values
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