Kaplan MQTD 4/27

[Young Chi]

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The half-life of 14C is approximately 5,730 years, while the half-life of 12C is essentially infinite. If the ratio of 14C to 12C in a certain sample is 25% less than the normal ratio in nature, how old is the sample?

1. A. Less than 5,730 years
2. B. Approximately 5,730 years
3. C. Significantly greater than 5,730 years, but significantly less than 11,460 years
4. D. Approximately 11,460 years

Sorry for the numbers (rough copy and paste). This one was pretty tough. Anyone care to shed sone ideas?

 

[ipmed]

Answer is A. Carbon 14 decays; not Carbon, and the half life has event passed yet, so it is less than 5730 years

 

[Young Chi]

Ahh I see, thanks.