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The half-life of a radioactive substance is:

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The half-life of a radioactive substance is: 

A. half the time it takes for the entire substance to decay 

B. usually about 50 years 

C. the time for radium to change into lead 

D. calculated from E = mc2 

E. the time for half the substance to decay

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E. the time for half the substance to decay

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