Question

5. A palaeontologist claims to have found a Woolly Mammoth fossil who lived 20,380 years ago. Carbon 14 dating reveals that 42.341% of the original 14C remains? The half-life for 14C is 5770 years. Assume the radioactive decay is first order. Should we accuse the palaeontologist of fraud? Enter your answer 6. A palaeontologist claims to have found a Tyrannosaurus Rex fossil who has lived about 70 million years ago. Uranium-235 dating has revealed that 93.3% of the original 235U remains? The half-life for 235U is 704 million years. Assume the radioactive decay is first order. Should we accuse the palaeontologist of fraud? Enter your answer

Answer 1

- we will find the age of wooly mamoth; if a it matches with the by calculation statement of palenoto logist; then it would be right. Nous; с“ , 111, = 5770 yes: 7. remaining now; = 42.341% means (ett year after ; 100%, of clh diecas till 42.3417 semaineel. Now; by first order radioactive kinetico . *= £ in toldos by formula of hall life ke in 2 tiz . set m (192351) 5773 2.10.859) = 7155.58 0.693 17.47156 years 7 Coppoon), but according to him; it was about 20,380 years old. so; By our calculation, the it seemed to be 7156 years old, so i he is doing fraud,

I © following similar pattern of calculations U235 tle = 704 million years let initial caose looy. . after time tyours & millim years Qt = 93.37. (now) applying first inder ** & morte) het n m lart) to everyone in (alat) t = 1 to 70.45 million year 70 million years Nis statement was Tyramo scuss Ron fossil was . old. about 70 million year. our calculation matches with his statement. so He said right. He is not doing fraud,

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