9:57
Answer
Hence in 77 days 107. will decay Remain = 90%
Explanation
Given: half life = 385 half-life
To find: what fraction remains after 22 days
Solution.
Let total amount = 100%.
time taken for decaying Si%. = 385
In time of 72 days = 305 77
= 5
→ Remarwiny = 50 = 10%.
Hence in 72 days 1-7. will decay Remain = 90%.
