Chemistry-
General
Easy
Question
The age of articles of org aniconic in can be estimated by radiocarbon dating. The radio-isotope carbon-14 is produced continuously in the upper atmosphere as the nitrogen atoms capture
cosmic ray neutrons.
The 14 C atoms react with oxygen molecules to form 14CO2, 14CO2 is absorbed by the plants in photosynthesis. Carbon-14 decays with a half Life Of 5730 years.
After death, the plant no Longer carries out photosynthesis, so it no Long er takes-up 14CO2 Other org anises that consume plants for food stop doing so at-death. The emission from 14C in dead tissue then decreases with the passage of time. The activity per g ram of carbon is a measure of the Length of time elapsed since death. The carbon-14 technique is useful only for dating objects for a Limited period of time.
Which one is correct?
- Carbon dating is predicted only for wood not older than 60000 years
- Carbon dating is predicted only for wood not older than 600 years
- Age of any older wood can be predicted by the radio carbon dating
- Radio carbon dating is used only for wooden objects
The correct answer is: Carbon dating is predicted only for wood not older than 60000 years
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