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The half-life of a radioactive substance is 10 days. This mean that:

a. The substance completely disintegrates in 20 days
b. The substance completely disintegrates in 40 days
c. 1/8 parts of the mass of substance will left intact at the end of 40 days
d. 7/8 parts of the mass of the substance disintegrates in 30 days

Sagot :

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