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 household refrigerator consumes electrical energy…A radioactive substance has a half-life of 3 days.…A substance has half of 3 min. After 6 min, the…After Solomon had the dream at Gibeon; the Lord…A radioactive substance has a half-life of 20 days…