pamelaorellana171 pamelaorellana171

02-12-2020
Mathematics

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If 16g if a radioactive substance are present initially and 5yr later only 8g remain how much substance will be present after 9yr

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sqdancefan sqdancefan

12-12-2020

9514 1404 393

Answer:

4.59 g

Step-by-step explanation:

The half-life is given as 5 years, so the amount remaining after 9 years will be ...

remaining = initial × (1/2)^(t/(half-life))

remaining = (16 g)×(1/2)^(9/5) ≈ 4.59 g

About 4.59 g of the substance will remain after 9 years.

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