The half-life of a sample depends on the identity of the isotope and not the amount present while activity does depend on the amount of the sample.

Question

Quizplus · Accepted Answer

The half-life of a sample is a characteristic property of a specific isotope and remains constant regardless of the amount of the sample present. However, activity (the rate at which a sample undergoes radioactive decay) is directly proportional to the amount of the sample present.

The Half-Life of a Sample Depends on the Identity of the Isotope