Question

A sample contains 2.2 g of the radioisotope niobium-91 and 15.4 g of its daughter isotope, zirconium-91. how many half-lives have passed since the sample originally formed? half-lives

Answer 1

The number of half-lives that has elapsed since the sample originally formed is 3 half-lives

Data obtained from the question

Original amount (N₀) = 15.4 + 2.2 = 17.6 g

Amount remaining (N) = 2.2 g

Number of half-lives (n) = ?

How to determine the number of half-lives that has elapsed

2ⁿ = N₀ / N

2ⁿ = 17.6 / 2.2

2ⁿ = 8

2ⁿ = 2³

n = 3

Thus, 3 half-lives has elapsed

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Answer 2

Answer:

3

Explanation:

e2022