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chemistry

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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

  • chemistry - ,

    Typo: The half-life is 5.7x10^3

  • chemistry - ,

    Without even doing the math it the change in disintegrations is merely .03333, the sample must have decayed for

    d. less than a few years

  • chemistry - ,

    whoops, i did the math and it came out to about 34,400 years. Sorry for my earlier answer

  • chemistry--can't get 34,000 yrs - ,

    k = 0.693/t1/2
    k = 0.693/5.7E3 = 1.22E-4

    ln(15.3333/15.3) = 1.22E-4(t)
    t = about 18 year.

  • chemistry - ,

    vanden bout

  • chemistry - ,

    actually drake was right on his first answer i had this question on my homework and it is d. less than a few years :)

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