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Question of the day
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Question of the Day (08-Jan-21)

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We have a radioactive substance which decays according to the rule that the decay rate at any instant of time is proportional to the amount of substance left. If 1/4th of the substance disappears after 10 days, then approximately how much time (in days) will it take for half the substance to disappear?

Use:  ln (3/4) = −0.29 and ln (1/2) = −0.693
OPTIONS
 
 1)20 days
 2)24 days
 3)18 days
 4)30 days

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