You are using carbon-dating to determine how old an indian puebloin the southwes

Question

You are using carbon-dating to determine how old an indian puebloin the southwestern US is. If the amount of C14 in the bone isapproximately 12.5 of the amount in the bone at the time the animaldied, that bone is? a. 5,730 yrsold b. 11,460yrs old c. 17,190 yrs old d. 2,865 yrs old HOW DO I DO THIS WITHOUT A CALCULATOR ON A TEST????????? THATS THEPOINT! LOL CAN SOMEONE SHOW ME STEP BY STEP a. 5,730 yrsold b. 11,460yrs old c. 17,190 yrs old d. 2,865 yrs old HOW DO I DO THIS WITHOUT A CALCULATOR ON A TEST????????? THATS THEPOINT! LOL CAN SOMEONE SHOW ME STEP BY STEP

Explanation / Answer

We know that the half life of C-14 is 5730 years Half life of the substancve is the time taken for the reactionof half of its amount. 100 -------> 50    it will take 1 halflife           1               2                  3 100 ------> 50 -------> 25 --------> 12.5 So, the no. of half lives for the the decay of C-14 to 12.5 is3 Therefore the age of the bone is 3 * half life = 3 * 5370years                                                                  = 17190 years

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