Radioactivity
Physics ⇒ Modern Physics
Radioactivity starts at 10 and continues till grade 12.
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See sample questions for grade 10
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.
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?
Which of the following is a correct statement about alpha particles?
(1) They are electrons
(2) They have a charge of +2e
(3) They are more penetrating than gamma rays
(4) They have no mass
Which of the following is a correct statement about the mass number after alpha decay?
(1) It increases by 2
(2) It decreases by 2
(3) It decreases by 4
(4) It remains the same
Which of the following is a man-made source of radiation?
(1) Radon gas
(2) Cosmic rays
(3) Nuclear power plants
(4) Soil minerals
Which of the following is a natural source of background radiation?
(1) X-ray machines
(2) Cosmic rays
(3) Nuclear reactors
(4) Smoke detectors
Fill in the blank: Beta decay results in the emission of a __________ from the nucleus.
Fill in the blank: The number of protons in the nucleus of an atom is called the __________ number.
Fill in the blank: The process by which an unstable nucleus loses energy by emitting radiation is called __________.
Fill in the blank: The radioactive decay law can be mathematically expressed as N = N0e-λt, where N is the number of __________ nuclei at time t.
State whether the following statement is true or false: Alpha particles can be stopped by a sheet of paper.
True or False: All isotopes of an element are radioactive.
True or False: Gamma radiation can be deflected by electric or magnetic fields.
True or False: Gamma rays have no mass and no charge.
