1.

A woord specimen from an archeological centre shows a ._(6)^(14)C activity of 5.0 counts/min/gm of carbon. What is the age of the specimen (t_(1//2) " for " ._(6)^(14)C is 5000 years) and a freshly cut wood gives 15 counts/min/g of carbon

Answer»

`5.78 xx 10^(4)` YEARS
`9.85 xx 10^(4)` years
`7.85 xx 10^(3)` years
`0.85 xx 10^(4)` years

Solution :`t = (2.303)/(0.693) xx 5000 xx "LOG" (15)/(5)`
`= (2.303)/(0.693) xx 5000 xx log 3 = 7927 = 7.92 xx 10^(3) yrs`


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