These exercises use the radioactive decay model. After 3 days a sample of radon-222 has decayed to 58% of its original amount.

a) What is the half-life of radon-222?

b) How long will it take the sample to decay to 20% of its original amount?

These exercises use the radioactive decay model. After 3 days a sample of radon-222 has decayed to 58% of its original amount.

a) What is the half-life of radon-222?

b) How long will it take the sample to decay to 20% of its original amount?