Scientists can determine the age of ancient objects by the method of radiocarbon dating. The bombardment of the upper at

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Scientists can determine the age of ancient objects by themethod of radiocarbon dating. The bombardment of the upperatmosphere by cosmic rays converts nitrogen to a radioactiveisotope of carbon, 14C, with a half-life of about 5,730 years.Vegetation absorbs carbon dioxide through the atmosphere, andanimal life assimilates 14C through food chains. When a plant oranimal dies, it stops replacing its carbon, and the amount of 14Cpresent begins to decrease through radioactive decay. Therefore,the level of radioactivity must also decay exponentially. Dinosaurfossils are too old to be reliably dated using carbon-14.
Suppose we had a 67 million year old dinosaur fossil. Whatpercent of the living dinosaur's 14C would be remaining today?(Round your answer to five decimal places.) %
Suppose the minimum detectable amount is 0.4%. What is themaximum age (in years) of a fossil that we could date using 14C?(Round your answer to the nearest year.)