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Question #076dd

1 Answer

May 21, 2017

#1/8# of the substance will remain undecayed after 30 days.

Explanation:

If the half life of the substance is #10 days#, it means that only half of the original quantity will remain at the end of #10 days#.

So #30 days# is #3xx10 = 3x#(half life) periods.

1) After #10 days# the remaining substance will be #1/2#

2) After #20 days# the remaining substance will be #1/2xx1/2=1/4#

3) After #30 days# the remaining substance will be #1/2xx1/2xx1/2=1/8#

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