87.5% decomposition of a radioactive substance completes in 3 hours. What is the half-life of that substanceA. 2 hoursB. 3 hoursC. 90 minutesD. 1 hours

87.5% decomposition of a radioactive substance completes in 3 hours. W

1.	87.5% decomposition of a radioactive substance completes in 3 hours. What is the half-life of that substanceA. 2 hoursB. 3 hoursC. 90 minutesD. 1 hours
Answer» Correct Answer - D `(0.693)/(t_(1//2)) = (2.303)/(180) xx "log" (100)/(12.5)` `t_(1//2) = (0.693 xx 180)/(2.303 xx 3 xx 0.3010) = 60` mini = 1 hr.

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87.5% decomposition of a radioactive substance completes in 3 hours. What is the half-life of that substanceA. 2 hoursB. 3 hoursC. 90 minutesD. 1 hours

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