Aradioactive polonium sample has a half-life of 103 years. how much of a 100 g sample would remain after 412 years?

6.25 g

Explanation:

The half-life of a radioactive isotope is the time needed for the mass of the sample to halve.

Here, we a radioactive polonium sample, whose half-life is

The mass of sample left after a time t is given by the equation

where

is the initial mass

is the half-life

If we substitute t = 412 y , we find the mass of sample left:

the entire statement is true and correct.  

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