Question

After two half-;ives (9 billion years) what percent of the orignal uranium remains?

Answer 1

The percentage of the orignal uranium that remains after two half-lives is 25%

Data obtained from the question

• Original amount (N₀) = 100%
• Number of half lives (n) = 2
• Percentage remainig (N) =?

How to determine the percentage remaining

N = N₀ / 2ⁿ

N = 100 / 2²

N = 100 / 4

N = 25%

Thus 25% of the original sample remains

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