Answer:
The amount of sample remain after 48 years is 12.5 g.
Amount of sample decayed = 100 g- 12.5 g = 87.5 g
Explanation:
Given data:
Half life of Pu²⁴¹ = 14 years
Total amount of sample = 100 g
Sample remain after 42 years = ?
Sample decayed = ?
Solution:
First of all we will calculate the number of half lives.
Number of Half lives = T elapsed / half life
Number of Half lives = 42 years / 14 years
Number of Half lives = 3
At time zero = 100 g
At first half life = 100 g /2 = 50 g
At second half life = 50 g/2 = 25 g
At third half life = 25 g/ 2 = 12.5 g
So the amount of sample remain after 48 years is 12.5 g.
Amount of sample decayed = 100 g- 12.5 g = 87.5 g
