How much of a sample remains after five half-lives have occurred?
a. 1/5 of the original sample
b. 1/25 of the original sample
c. 1/32 of the original sample
d. 1/64 of the original sample

1/32 of the original sample

Explanation:

The half life of a material refers to the time it takes for the material to decay to half of the original amount present.

If N=1/2 No after one half life, then after five half lives;

N= (1/2)^5No

N= 1/32 No hence the answer

Note N= amount of radioactive substance present at a time (t)

No= initial amount of radioactive substance present at t=0

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