How do you calculate the half life of carbon 14?

A quick way to calculate Half-Life is to use the expression:
##t_((1)/(2))## = ##(0.693)/(lambda)##
Where ##lambda## is the decay constant and has the value of
1.21 x ##10^(-4) yr^(-1)##
So ##t_((1)/(2))=(0.693)/((1 .21).(10^(-4))##
##t_((1)/(2))## = 5.73 x ##10^(3) yr##
Let me know if you would like the derivation of this.

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