The β-activity of 1.2 g of carbon from a freshly cut tree is measured to be 0.30 Bq. If the β-activity of 1.2 g of carbon from an ancient manuscript under the same conditions is found to be 0.20 Bq (given: t1/2 = 6930 years), what is the estimated age of the manuscript?
1
6000
2
5430
3
4054
4
3000