Radioactivity
Physics ⇒ Modern Physics
Radioactivity starts at 10 and continues till grade 12.
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See sample questions for grade 10
A radioactive element has a decay constant (λ) of 0.1 per year. What is its half-life? (Use the formula t1/2 = 0.693/λ)
A radioactive isotope has a half-life of 10 years. How many years will it take for the activity to fall to one-eighth of its original value?
A radioactive sample has a half-life of 3 hours. If you start with 80 grams, how much will remain after 6 hours?
A sample contains 2000 radioactive nuclei. After 2 half-lives, how many undecayed nuclei remain?
Describe one harmful effect of exposure to high levels of radiation.
Describe one way radioactivity is used in medicine.
Describe the main difference between alpha, beta, and gamma radiation.
Describe what is meant by background radiation.
Explain why lead is often used as a shielding material against gamma radiation.
Explain why radioactive decay is considered a random process.
Explain why radioactive waste must be carefully managed.
What is a Geiger-Müller tube used for?
What is meant by the term 'activity' in radioactivity?
What is meant by the term 'daughter nucleus' in radioactive decay?
What is radioactivity?
What is the SI unit of radioactivity?
