a container holds a pure sample of a radioactive substance with a half-life of 2 hours.

A container holds a pure sample of a radioactive substance with a half-life of 2 hours.
Part A
Which of the following statements are true?
a) After 1 hour, less than 50\% of the original atoms in the container will have decayed.
b) After 1 hour, more than 50\% of the original atoms in the container will have decayed.
c) After 2 hours, 50\% of the original atoms in the container will have decayed.
d) After 4 hours, 25\% of the original atoms will have decayed.
e) After 4 hours, the total number of atoms in the container will be reduced by 75\%.
Answer: A and C

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