Alana T.

asked • 10/03/19

Decay of Substance

The​ half-life of a certain substance is 17 years. How long will it take for a sample of this substance to decay to 64​% of its original​ amount?

Use the Exponential Decay Model A=Aoe^kt



1 Expert Answer

By:

Sunil K. answered • 10/04/19

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Alana T.

understanding which values go into the equation and where they go.
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10/05/19

Sunil K.

A = A0 x e^kt ||A = final amount (64%), A0 = initial amount (100%), k = ln (0.5) / (half life) ...this comes from half life equation so it becomes k = ln (0.5) / 17, t = time (solve for this) || 64 = 100 x e^[(ln (0.5)/17)t] || ...now solve for t
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10/05/19

Sunil K.

sorry its really hard to type in logical fashion in this thread. but i tried to separate the sentences by the double bars.
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10/05/19

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