SOLUTION: Please show step by step. Thanks
An unknown radioactive element decays into non-radioactive substances. In 980 days the radioactivity of a sample decreases by 52 percent.
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Question 998642: Please show step by step. Thanks
An unknown radioactive element decays into non-radioactive substances. In 980 days the radioactivity of a sample decreases by 52 percent.
(a) What is the half-life of the element?
half-life: (days)
(b) How long will it take for a sample of 100 mg to decay to 77 mg?
time needed
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
General model and you have starter information so that you can find the value for k. Also half-life.
The 52% decrease after 980 days,
-----------------------(and this step you will use again).
-
Information given in description is , and this "48" is because that is what remains as percent after 52% decayed.
You should be able to do the rest of the questions and steps.
---
Still wanted more steps to the solutions---
(a) Half-Life
Return to this part:
What was k? Substitute the given values in the main part of the description!
The model for decay is now .
-
The step to find any time t,
You know the needed values for finding half-life with this formula, so substitute THEM.
----the half-life.
(b) How long to decay from 100 mg to 77 mg ?
You have the formula and model to use.
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