Question

The half-life of thorium-229 is 7340 years (a) Compute the time required for a given sample to be reduced by a factor of 1000. (Round your answer to the nearest whole number.) 73,149 yr (b) Express your answer in part (a) in terms of half-lives. (Round your answer to the nearest whole number) 10 half-lives (c) Using half-lives as in Example 7(b), estimate the time required for a given sample for thorium-229 to be reduced by a factor of 1000. (Round your answer to the nearest whole number.) x yr

Part c

Answer 1

(C) using half mer lising half-lives as in example 7(b) .e, 10 as entioned here, time required for a given ople for thonium-229 to be reduced by a factor of 1000. Now, the amount of radionucte ir Left aftero'nnembers of half lives No No a initial number of : 2 radionuclar present Here na 10 (given in 7(b) example) "The integrated nate equation for the decay of Th-229, to in ty from Th-227 ko made constant - on disintegration 2 7340 yr. In No Constant, 0.693 Ō.693 No/n 7340 hr. In 210 2 73415.588 years. 0-693 273416 years 77340yrs. Z ? tue In No 0.893 in a non t/