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# Carbon 14 dating watch

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1. Question:
Carbon 14 dating allows the age of carbon based material to be estimated. Explain this process with reference to the carbon isotopes involved.

Erm...process?
2. Carbon in "carbon-based material" contains a constant ratio of the isotopes of carbon.

But carbon-14 decays as it is radioactive. (Carbon-12 and carbon-13 do not decay.)

From these two points, you can work out the age of a fossil by simple mass spectrometry and maths.

I think?

3. Um, carbon-14 has a half life of about 5600 years, i think.
There are about 1 in every 10 000 000 particles.
From this, you'll be able to work out the date of a object

i'll use an example:

A piece of cloth contains 1 in 40 000 000 particles. calculate the age from which this cloth is made.

at the time in which it was made, there'll be 1 in 10 000 000
after on half life, it'll have 1 in 20 000 000
after two half lives, it'll have 1 in 40 000 000.

So two half lives have passed.........two half lives = 5600*2 = 11200

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