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Planks from an old boat were found in a cave near
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Answer #1

Ratio = 13.6 dis/mingC / 15.3 dis/mingC

Ratio = 0.88888

The ratio is equal to

Ratio = 2(t / t1/2)

log(Ratio) = -(t / t1/2) * log2

t = -t1/2 x log(Ratio) / log2
t = -5730yr x log 0.8888 / log2
t = -5730yr x (-0.05115) / 0.3010
t = 973 years old

The year 1043 it was built. Hence it is about 11th centuary

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