Question

3. The half-life of a radioisotope is the amount of time it takes for
half the sample to decay.
all the sample to decay.
the age of an artifact to be calculated.
detectable radiation to be absorbed by a sample.
4. Which of the following statements is true?
Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.
Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not.
Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.
Neither chemical reaction