Acontainer holds a pure sample of a radioactive substance with a half-life of 2 hours. part awhich 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\%.