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dumbadum
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I was doing a question which gave the decay rate of the ancient substance as 13.2dpm. The question asked that assuming living plants now has a disintegration rate of 15.3 dpm, and the half-life of carbon-14 is 5730 years, what is the age of the ancient substance.
I went on the internet, and got a question similar to this:
Charcoal @ stone Henge has C14 in concentration which produced 8.2dpm/gram
normal C14 from a tree is 13.5 dpm/g
half life of C14 is 5568 years,
what is the age of the charcoal.
There was a solution on the website which went something like this:
Law of radioactive decay:
Radioactive decay at rate that is proportional to the amount of radioactive material present.
d/dt (decay(t)) = -kdecay(t)
t=0 at the time when stone henge is built
decay(0) = 13.5
decay(t) = 13.5 x 10^(-kt)
13.5x10^(-k5568)=0.5(13.5)
Then I just got so confused...
Please explain how exactly to start a question regarding radioactive decay and what is disintegration per minute per gram?
I went on the internet, and got a question similar to this:
Charcoal @ stone Henge has C14 in concentration which produced 8.2dpm/gram
normal C14 from a tree is 13.5 dpm/g
half life of C14 is 5568 years,
what is the age of the charcoal.
There was a solution on the website which went something like this:
Law of radioactive decay:
Radioactive decay at rate that is proportional to the amount of radioactive material present.
d/dt (decay(t)) = -kdecay(t)
t=0 at the time when stone henge is built
decay(0) = 13.5
decay(t) = 13.5 x 10^(-kt)
13.5x10^(-k5568)=0.5(13.5)
Then I just got so confused...
Please explain how exactly to start a question regarding radioactive decay and what is disintegration per minute per gram?