Question

Boron-12, an unstable nucleus, undergoes the following decay process. The half-life for this beta decay is 20.2 milliseconds and the atomic mass of Boron-12 is 12.0143521 u.

.a) What is the binding energy per nucleon for Boron-12? (5 pts)

.b) A 275 g sample of this isotope of Boron contains how many nuclei? (1 pt)

.c) If you started with a 275 g sample of Boron-12 at time t = 0, how many nuclei of this isotope would be left at t = 0.500 seconds? (3 pts)

.d) What is the activity of this 275 g sample of Boron-12 in decays/second at t = 0.500 seconds? (1 pt)

Answer 1