Question 4 1 pts Minerals containing uranium can be dated to determine their app

Question

Question 4 1 pts Minerals containing uranium can be dated to determine their approximate age by analyzing the isotopes of lead found in the sample. Uranium-236 decays to lead-206, Lead-206 is not a common isotope of lead, so any lead-206 found in a mineral must come from the decay of uranium-236, A mineral was analyzed, and its mass spectrum is shown below 100 75 50 25 238 206 Relative botopic mass If the radioactive decay of uranium-236 is first order with a half-life of 4.5 billian years, estimate the age of the sample. Do this without a calculator. O 6.8 billion years O 2.3 billion years O 9.0 billion years O 45 billion years

Explanation / Answer

Given

half life = 4.5 billion years

from the graph amount of lead 206 will give amount of u236 decayed = 50 %

time taken to become half of orginal value = 4.5 billion years

answer is 4.5 billion years

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