Answer:
Half life = 1.83 sec
Explanation:
Given data:
Total amount of Ar-35 = 1.80 g
Amount left after 5.49 sec = 0.225 g
Half life of Ar-35 = ?
Solution:
At time zero = 1.80 g
At first half life = 1.80 g/2 = 0.9 g
At 2nd half life = 0.9 g/2 = 0.45 g
At 3rd half life = 0.45 g/2 = 0.225 g
Half life:
Half life = Time elapsed / number of half lives
Half life = 5.49 sec / 3
Half life = 1.83 sec
