← back to the Substrate Record
qid 3797 · chemistry
Question: A sample of bristle cone pine wood of age 7,000 \pm 100 years, known by counting growth rings, possesses an activity of 6.6 d(disintegrations) / minute-g of carbon. Calculate the exact age of the wood sample from radiochemical evidence.
- 6,400 years old
- 6,225 years old
- 7,500 years old
- 6,600 years old
- 7,000 years old
- 7,200 years old
- 6,950 years old
- 5,500 years old
- 6,800 years old
- 5,730 years old
Our answer: B. 6,225 years old Source quote machine-checked (exact quote)
How it was answered
Multi-step solver (maze), replayed by code
Current source
Wikipedia, "Radiocarbon dating"
https://en.wikipedia.org/wiki/Radiocarbon_dating
“Because 14 C decays at a known rate, the proportion of radiocarbon can be used to determine how long it has been since a given sample stopped exchanging carbon – the older the sample, the less 14 C will be left.”
Source quote machine-checked (exact quote)
Earlier version (superseded)
No public source has been found for this card yet (3 places checked internally).
If you have a Citable Source to dispute or challenge this, ADD IT so we can correct the answer by appending, never deleting. — hello@lianabanyan.com