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%.
Correct Answer: D. the length of time during which the activity of the substance reduces by 50%.
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