A specific substance follows a continuous exponential decay model. It has a half-life of 5 days.?

Help me with this question please. much appreciated!!

Question: A specific substance follows a continuous exponential decay model. It has a half-life of 5 days. At the start of the expriment, 365.8 g is present.

a) Let t be the time (in days) since the start of the expriment, and let y be the amount of the substance at the time t.

Write a formula relation y to t.

b) how much will be present in 21 days?

Thank you!

1 Answer

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  • 3 weeks ago

    a) Let t be the time (in days) since the start of the experiment, 

    and let y be the amount of the substance at the time t.

    Write a formula relation y to t.

    y = 365.8(1/2)^(t/5) <–––––

    b) how much will be present in 21 days?

    y = 365.8(1/2)^(21/5)

    y = 19.903

    19.9 g <–––––

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