Answer to Question #282928 in Atomic and Nuclear Physics for BIGIRMANA Elie

Question

One (1) gram of aradioactive substance disintegrates at the rate of 3.7 × 1010 per

second. The atomic weight of the substance is 226. Calculate its mean life.

Answer 1

$\tau=\frac NA=\frac{mN_A}{MA}=7.2\cdot 10^{10}~s.$