The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take 78 of the sample to decay

by | Jan 9 | Physics WAEC | 0 comments

A. 15 hours
B. 30 hours
C. 45 hours
D. 60 hours

Correct Answer:

Option C – 45 hours