How do you calculate half life?

Answer

To calculate half of a life, you will first need to know how long the whole life is. If a person lived to be 80, then half of that life would be 40. You will just divide the age at which the person or animal died, by two.
Q&A Related to "How do you calculate half life?"
1. Divide the amount of time that has passed by the half life of the substance to find the number of half lives. For example, if your substance has a half life of 1 month and the
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Check the time between your first decay rate and when the decay rate reaches half this number.
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it takes 713 million years for half of the U235 to decay to lead-207. half-lives: 1 = 50% U235 . & 50% lead-207. 2 = 25% U235 & 75% lead-207. 3 = 12.5% U235 and 87.5% lead
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Half-life is the period of time it takes for a substance undergoing decay to
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1 Additional Answer
Ask.com Answer for: how to calculate half life
How to Calculate Half-Lifes
A half-life is the time that a substance takes for half of it to disappear. For example, the half-life of uranium-235 is 700 million years. It takes another 700 million years for half of the remainder to decay. Therefore after 1.4 billion years, 25% of... More »
Difficulty: Moderately Easy
Source: www.ehow.com
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