The activity of a radioactive substance is R1 at time t1 and R2 at time t2 (>t1). Its decay constant is lemda. Then The activity of a radioactive substance is R1 at time t1 and R2 at time t2 (>t1). Its decay constant is lemda. Then October 17, 2020 Category: Uncategorised (JEE Advanced Physics by [...]