Question

1. A) A 250. mg sample of carbon from a piece of cloth excavated from an ancient tomb undergoes 1.50 x 103 disintegrations in 10.0 h. If a current 1.00 mg sample of carbon shows 921 disintegrations per hour, how old is the piece of cloth?

B) Calculate the energy released per gram of starting material in the fusion reaction:

7Li + 1H --------> 2 4He (7Li, 7.0160 amu)

Answer 1