1.

The half life of a radioactive substance is 20 minutes, The time taken between 50% decay and 87.5% decay of the substance will be

Answer»

40 mintues
10 mintues
30 mintues
25 mintues

Solution :50% decay is HALF LIFE =20 min
NEXT 25% decays again in 20 min
Further 12.5 decays in 20 min
Total time of decay 50%+25%+12.5%=60min
So difference in time of 87.5% decay and 50% decay is =60-20=40min.


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