Question

6. The half-life of a radioisotope is the amount of time it takes for (1 point)
the age of an artifact to be calculated.
half the sample to decay.
detectable radiation to be absorbed by a sample.
all the sample to decay.

Answer 1

17. Which of the following statements is true? (1 point)
Chemical reaction rates vary with the conditions of the change, but nuclear decay rates do not.
Nuclear decay rates vary with the conditions of the change, but chemical reaction rates do not.
Both chemical reaction rates and nuclear decay rates vary with the conditions of the change.
Neither chemical reaction rates nor nuclear decay rates vary with the conditions of the change.

Answer 2

The half-life of a radioisotope is the amount of time it takes for half the sample to decay. (hence the name half-life)

Chemical reaction rates vary with the conditions of the change, but nuclear decay rates do not. Chemical reactions are affected by things like temperature, nuclear decay is not.