Discussion
Choose the material on which 14C dating technique can be correctly applied.
Answer: A
14C dating can be applied to charred food grains from the Indus Valley civilization.
Radiocarbon dating works on carbon that was once part of a living organism exchanging carbon with the atmosphere, and it only reaches back about 50,000 years, since the half-life of 14C is about 5,730 years. Charred grain is plant carbon taken from the air a few thousand years ago, well inside that range.
The other three fail on both counts. Organic matter in carbonaceous chondrites is about 4.56 billion years old and was never in equilibrium with the Earth’s atmosphere. Diamonds formed from mantle carbon, mostly more than a billion years ago. Proterozoic graphite is older than 541 million years. In each case any original 14C decayed away long ago.
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