Half-life and Decay — Prelims Questions

Which of the following statements about the half-life of a radioactive substance is INCORRECT?

A sample of a radioactive isotope has a half-life of 10 days. If the initial activity of the sample is 800 Bq, what will be its activity after 30 days?

Consider the following statements regarding Carbon-14 dating: 1. It is used to determine the age of non-living inorganic materials. 2. Its effective dating range is up to approximately 50,000-60,000 years. 3. The method relies on the decay of Carbon-14 to Nitrogen-14. Which of the statements given above is/are correct?

Which of the following medical isotopes is correctly matched with its primary application and half-life?

If the decay constant (λ) of a radioactive isotope is 0.0231 day⁻¹, what is its approximate half-life?