List of top Physics Questions on Radioactivity asked in SRMJEEE

A piece of an ancient wooden boat shows an activity of C¹⁴ of 3.9 disintegrations per minute per gm of carbon. Estimate the age of the boat, if the half life of C¹⁴ is 5.568 years. Assume that the activity of fresh carbon -14 is 15.6 dpm.gm