Let No be the number of radioactive atoms at the initial moment of time. How many radioactive nuclei will decay in a time equal to

Let No be the number of radioactive atoms at the initial moment of time. How many radioactive nuclei will decay in a time equal to:
a) one half-life?
b) two half-lives?
c) three half-lives?

a) half of the nuclei will decay during the half-life: N0 / 2;
b) 3N0 / 4 nuclei will decay in two half-lives;
c) 7N0 / 8 nuclei will decay in three half-lives.

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