Radioactivity
Physics ⇒ Modern Physics
Radioactivity starts at 10 and continues till grade 12.
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See sample questions for grade 11
A radioactive isotope has a half-life of 10 days. If you start with 40 grams, how much will remain after 30 days?
A radioactive sample contains 8000 atoms. If the half-life is 2 hours, how many atoms will remain after 6 hours?
A radioactive sample has an initial activity of 1600 Bq. After 3 half-lives, what will be its activity?
A scientist finds a fossil containing 25% of its original radioactive carbon-14. If the half-life of carbon-14 is 5730 years, estimate the age of the fossil.
Describe the difference between alpha, beta, and gamma radiation in terms of their composition and penetrating power.
Describe the process of beta-minus decay in terms of changes in the nucleus.
During radioactive decay, the atomic number of an element decreases by 2 and the mass number decreases by 4. Which type of decay is this?
Explain what is meant by the term 'radioactive equilibrium'.
Explain why gamma radiation is more penetrating than alpha or beta radiation.
If a radioactive element has a half-life of 5 years, what fraction of the original sample will remain after 15 years?
If a radioactive sample has a decay constant (λ) of 0.693 day-1, what is its half-life?
State one medical application of radioisotopes.
State the law of radioactive decay.
What is the main difference between natural and artificial radioactivity?
