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The half-life of a radioactive substance is

Physics
WAEC 1999
The half-life of a radioactive substance is
  • A. its average life time
  • B. one-half the value of its decay constant.
  • C. the length of time needed by the substance to decay completely
  • D. the length of time during which the activity of the substance reduces by 50%.
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Correct Answer: Option D
Explanation
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