A sample of rock from the moon contains an exactly equal number of atoms of Uranium-238 and Lead-206. Assuming all the Lead originated purely from the decay of the Uranium, and given for U-238 is , ca

Question

A sample of rock from the moon contains an exactly equal number of atoms of Uranium-238 and Lead-206. Assuming all the Lead originated purely from the decay of the Uranium, and given $T_{1/2}$ for U-238 is $4.5 	imes 10^9	ext{ years}$, calculate the exact age of the rock.

Prashant Kotian · Accepted Answer

Correct answer: B. Current U = Pb. Initial U () = Current U + Pb = 2(Current U). Since the amount of U has dropped to exactly half of its original initial amount (), exactly one half-life has elapsed. The age is .

💡 Solution & Explanation

Practice 22,000+ questions like this