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Problem: To solve this problem you should remember the general decay law from high school calculus. The radioactive decat of nuclei is usually described quantitatively with the parameter T. Let us define the half-life ,T, as the time in which 1/2 of the particles decay. The natural uranium ore now consists of ç1=99.28% 238U and ç2=0.72% 235U. Half-life periods of 238U and 235U nuclei are correspondingly equal to T1=4.47*10^9 years and T2=0.70*10^9 years. Estimate the Earth's age assuming the amounts of two isotopes were equal at the moment of birth of our planet.