Question

The half-life of a radioactive kind of radium is 11 days. If you start with 72 grams of it, how

much will be left after 22 days?

Answer 1

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Actually Welcome to the concept of Radioactive decay.

N(t) = 72(1/2)^22/11

==> N(t) = 72 (1/2)^2

==> N(t) = 72/4

==> N(t) = 18 grams.

So the remaining would be 18 grams.