Answer 5_3_1
|
A
sample of living material contains carbon 14 with an activity of 260 Bq kg-1.
What is the decay constant? (The fraction that is made of carbon-14
is 1.4 ´
10-12) |
|
No of particles = 1000
× 6 × 1023 ´ 1.4 ´ 10-12 = 7 × 1013 (P) |
|
12 |
|
Use DN/Dt
= -lN
(P) |
|
-260 = -l × 7 × 1013 |
|
l
= 3.7 × 20-12 s-1 (P) |