Which statements describe half-life? Check all that apply.Each isotope has a half-life that is different from the half-life of other isotopes.All isotopes have the same half-life.The half-life of an isotope is always the same.The half-life of an isotope changes constantly.An isotope’s half-life is affected by temperature, pressure, density, and concentration.An isotope’s half-life is not affected by temperature, pressure, density, or concentration.
Answer
A
Each isotope has a half-life that is different from the half-life of other isotopes.
B
All isotopes have the same half-life.
C
The half-life of an isotope is always the same.
D
The half-life of an isotope changes constantly.
E
An isotope’s half-life is affected by temperature, pressure, density, and concentration.
F
An isotope’s half-life is not affected by temperature, pressure, density, or concentration.
Explanation
A radioactive isotope has a characteristic half-life, so its half-life stays the same rather than changing constantly. Different isotopes generally have different characteristic half-lives, making A and C correct. Ordinary changes in temperature, pressure, density, or concentration do not affect an isotope’s half-life, so F is also correct.
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