The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days. What would be the count rate per minute after 15 days? by Sunday | Aug 29 | Physics WAEC | 0 comments A. 20 B. 25 C. 50 D. 200 E. 400 Correct Answer: Option C – 50 Users Also Read These:A radioactive substance has a half-life of 20 days…A radioactive substance has a half-life of 3 days.…How many molecules of oxygen would occupy a volume…If the opening stock is Le200, cost of goods sold…A household refrigerator consumes electrical energy…