A radioactive substance has an average life of 5 hours. In a time of 5 – McqOptions

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1.	A radioactive substance has an average life of 5 hours. In a time of 5 hours [Orissa JEE 2003]
A.	Half of the active nuclei decay
B.	Less than half of the active nuclei decay
C.	More than half of the active nuclei decay
D.	All active nuclei decay
Answer» D. All active nuclei decay

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