In 660 days unknown radioactive substance decay to 33 percent of its size. 1)What is the half life of this substance? t= 2)How long will it take for a sample of 100mg to decay to 60 mg? T= not sure how to start this one
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Originally Posted by viet In 660 days unknown radioactive substance decay to 33 percent of its size. 1)What is the half life of this substance? t= 2)How long will it take for a sample of 100mg to decay to 60 mg? T= not sure how to start this one Assume that you start with 1 unit, then after 660 days, you will have 0.33 units left so use to find then use the formula , where is the half-life i think you will be able to handle the next question after getting this
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