Physics
JAMB 1979
Which of the following is the correct definition of 'half-life'?
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A.
the average life-time of a radioactive material
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B.
the time it takes a radioactive material to decay to half of its original quantity
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C.
half the period a radioactive material decays completely
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D.
half of the decay constant
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E.
the decay constant times life-time
Correct Answer: Option B
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