1.

The half-life of a radioactive material is 10 days. What does this mean?

A. The substance will completely disintegrate in 20 days.
B. The substance will completely disintegrate in 40 days
C. 3/4 of the substance will disintegrate in 20 days
D. 1/4th of the substance will disintegrate in 5 days
Answer» D. 1/4th of the substance will disintegrate in 5 days


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