Posted by **Eddy** on Monday, April 25, 2011 at 2:33pm.

A 1.00-g sample of carbon from a modern

source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? The half-life of carbon-14 is 5.73×103 year.

a. about 34,400 years

b. about 345,000 years

c. about 20 million years

d. less than a few years

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