Radioactivity
Physics ⇒ Modern Physics
Radioactivity starts at 10 and continues till grade 12.
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Describe one practical application of radioisotopes in medicine.
Describe the difference between alpha, beta, and gamma radiation in terms of their composition and penetrating power.
Explain why gamma emission does not change the atomic number or mass number of a nucleus.
Explain why radioactive decay is considered a random process.
A radioactive isotope has a half-life of 10 days. How many days will it take for the activity to fall to one-eighth of its original value?
A radioactive sample has a half-life of 5 years. If you start with 80 grams, how much will remain after 15 years?
A radioactive sample has an initial activity of 4000 Bq. After 3 half-lives, what is its activity?
A sample contains 1.2 x 1024 atoms of a radioactive isotope with a half-life of 2 hours. How many atoms will remain undecayed after 6 hours?
Which of the following best describes the change in atomic number during alpha decay?
(1) Increases by 2
(2) Decreases by 2
(3) Increases by 1
(4) No change
Which of the following is a correct statement about the nature of radioactive decay?
(1) It can be stopped by chemical reactions
(2) It is a spontaneous process
(3) It requires external energy
(4) It only occurs at high temperatures
Which of the following is a property of beta particles?
(1) They are heavier than alpha particles
(2) They are deflected by magnetic fields
(3) They have no charge
(4) They are not affected by electric fields
Which of the following is NOT a type of radioactive decay?
(1) Alpha decay
(2) Beta decay
(3) Gamma decay
(4) Delta decay
The decay constant (λ) is related to the half-life (T1/2) by the formula __________.
The emission of a positron from a nucleus is known as __________ decay.
The number of disintegrations per second in a radioactive sample is called its __________.
The process by which an unstable nucleus loses energy by emitting radiation is called __________.
State whether the following statement is true or false: All isotopes of an element are radioactive.
State whether the following statement is true or false: The half-life of a radioactive substance depends on temperature and pressure.
State whether the following statement is true or false: The mass number of a nucleus changes during beta decay.
True or False: The activity of a radioactive sample decreases exponentially with time.
