How long will it take a 4.50-kBq sample of material to reach an activity level of $0.140 \mathrm { kBq }$ if the half-life of the sample is 435 years?

Name: How long will it take a 4.50-kBq sample of material to reach an activity level of $0.140 \mathrm { kBq }$ if the half-life of the sample is 435 years?
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The Answer of How long will it take a 4.50-kBq sample of material to reach an activity level of $0.140 \mathrm { kBq }$ if the half-life of the sample is 435 years?

How Long Will It Take a 4 0.140kBq0.140 \mathrm { kBq }0.140kBq

How Long Will It Take a 4 $0.140 \mathrm { kBq }$