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find half life..

1) A geiger counter registers an initial reading of 3200 countsmeasuring a radioactive substance and
100 counts 30hrs later. Whatis the half life of this substance?
Transcribed Image Text:1) A geiger counter registers an initial reading of 3200 countsmeasuring a radioactive substance and 100 counts 30hrs later. Whatis the half life of this substance?
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