# Number 14 carbon 14 dating denotes

Find an expression for the quantity remaining after t years. A 25.0 gram piece of charcoal is found in some ruins of an ancient city. It decays according to the equation y=ae -0.0856t where t is in days. It decays according to the equation y=ae -0.0856t where t is in days. What is the total amount of the original Carbon-14 still present in the fossil? The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years.

the amount of carbon-14 in a mammoth's bone is 45% of the amount found in a living organism. The sample shows a 14C activity, R, of 250 decays/min. the age of granite can be determind using radiometric dating, explain the basis for the determination of a 238 U- Pb radiometric date of 1120 Ma for a granite. A rock contains 65.7% of the amount of uranium- 238 that it contained ... If 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?

The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope 14C of carbon with a half-life of about 5710 years. An Initial amount of 100 grams of Thorium-234 decays according to the model: d P/dt=-0.02828P (where t is measured in years). Where m is the mass, in milligrams, remaining after t years.

Decay begins when the living thing (like a tree) dies.How long (in years) has the tree this charcoal came from been dead? I have as the answer 238 U decays to Pb with an experimental law, that is the amount of U and Pb in granite are ... Begin amount is 1.0 elapsed time is 90y half life 30 years n=9/30 n=3 90/2^2 90/8 = 11.25mg thinking it's wrong not sure what I missed... If 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?I think I have the use the equation: R=lamda*No*e^(-lamda*t) but I am not sure ... What can scientists learn from the rate at which radioactive elements decay? Begin amount is 1.0 elapsed time is 90y half life 30 years n=9/30 n=3 90/2^2 90/8 = 11.25mg thinking it's wrong not sure what I missed... What is the age of a fossil containing 1/16 the amount of Carbon-14 of living organisms? If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elapse before only 35% of the radioactive substance remains?Tenofovir displayed antiviral activity in vitro against HIV-1 clades A, B, C, D, E, F, G and O (IC values ranged from 0.5-2.2 µM).Emtricitabine and tenofovir disoproxil fumarate: HIV-1 isolates with reduced susceptibility to the combination of emtricitabine and tenofovir have been selected in vitro.