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. Solve for the natural logarithm, or the "LN, of 1/2. This expresses that 50 percent of the original amount of the isotope has decayed. 2. Find the rate of decay for the isotope
http://www.ehow.com/how_8589002_calculate-halflife...
Check the time between your first decay rate and when the decay rate reaches half this number.
http://wiki.answers.com/Q/How_do_you_calculate_hal...
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
http://answers.yahoo.com/question/index?qid=200903...
1 Learn to bunny hop. There are many good how-to videos on YouTube. Follow the steps to making good bunny hops. Take a few days to get used to it. It might actually take a few weeks
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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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