Every radioactive substance is in a constant state of decay (changing from being unstable to being stable). Which phrase is used for the length of time it takes for a certain number of atoms in a radioactive substance to decay and become stable?
A) half life
B) term life
C) stable time
D) unstable time
A
Explanation: A) Correct!
B) This does not describe radioactive decay over time.
C) This does not describe radioactive decay over time.
D) This does not describe radioactive decay over time.
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