Find out more about that in our drug half-life calculator. The half-life is independent of concentration, temperature, and pressure, i.e., the t 1/2 is a characteristic constant of a radioisotope. Check our generation time calculator to learn how exponential growth is both useful and a problem in laboratories! Also, we use a similar concept in pharmacology, and we call it the "drug half-life". Half-life is a similar concept to doubling time in biology. If you are not certain that our calculator returned the correct result, you can always check it using the half-life formula.Ĭonfused by exponential formulas? Try our exponent calculator.The carbon in fossil fuels has been buried for millions of years and therefore is. If we solve for t, we get: t 5730ln 1ln10 ln2. Carbon-14, or 14C, a very rare isotope of carbon created largely by cosmic rays, has a half-life of 5,700 years. Dividing both sides by 10 and applying the definition of natural log gives. To find when f(t) 1, we use the value of c from part a which gives us the equation. Determine the initial amount of a substance. which is approximately equal to 0.000121.
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