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toni_malvina toni_malvina
wrote...
11 years ago
Example: Calculate the time required for three-fourths of a sample of cesium-138 to decay given that its half-life is 32.2 minutes.
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ASJ
wrote...
11 years ago
After one half-life, half is gone.  After the second half-life, half of that half is gone, leaving only 1/4 of the remaining amount.  So 3/4 has decayed.  Just add two half-lives.
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