Question

The half-life of radon is 385 days. What fraction of a sample with no atoms remains at the end of 77 days?​

Answer 1

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%.

Answer 2

Explanation:

calculate the missing angle 'a'