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Answer :
The amount of substance that will remain after one day is 1.3 grams
What is radioactive decay?
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
The number of substance left after a period of time is expressed as:
N(t) = N(o) e^-kt
k = 18/100 = 0.18
t = 1 day = 24hours
N(o) = 100
therefore;
N(t) = 100e^-0.18(24)
N(t) = 100e^-4.32
N(t) = 100 × 0.013
N(t) = 1.3 grams
therefore the number of substance left after a day is 1.3 grams
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