Carbon‑14 is a radioisotope that is used for dating biological organisms. The half‑life of C‑14C‑14 is 5730 years. When a 1 g sample of carbon from fresh peat is measured for radioactivity, 900 beta decays are recorded every hour.
A 1 g sample of carbon is obtained from a peat deposit and is measured for radioactivity.
If 450450 beta decays are observed every hour, how many half‑lives of C‑14C‑14 have passed since the deposit was formed?
A. 450450
B. 1212
C. 11
D. 22