The carbon-14 activity of some ancient Indian corn was found to be 2.0 disintegrations per minute (dpm) per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5730 yr) Multiple Cholce 6800 yr 2500 yr O 4700 yr 17,000 yr 5700 yr 7200 yr 9600 yr O 10,000 yr

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