Radioactivity
Physics ⇒ Modern Physics
Radioactivity starts at 10 and continues till grade 12.
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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.
State one medical application of radioisotopes.
State the law of radioactive decay.
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.
Which of the following is a correct statement about the charge of a beta-plus (β+) particle?
(1) Positive
(2) Negative
(3) Neutral
(4) Double positive
Which of the following is a correct statement about the mass number after beta-minus decay?
(1) It increases by 1
(2) It decreases by 1
(3) It remains unchanged
(4) It doubles
Which of the following is a property of alpha particles?
(1) High penetration
(2) Negative charge
(3) Consist of 2 protons and 2 neutrons
(4) Travel at the speed of light
Which of the following is NOT a type of radioactive decay?
(1) Alpha decay
(2) Beta decay
(3) Gamma decay
(4) Delta decay
The activity of a radioactive sample is measured in __________.
The process by which an unstable atomic nucleus loses energy by emitting radiation is called __________.
The SI unit of radioactivity is the __________.
The time required for a radioactive substance to reduce to one-fourth of its original amount is __________ times its half-life.
True or False: All isotopes of an element are radioactive.
True or False: Beta particles can be stopped by a sheet of paper.
True or False: The decay constant (λ) and half-life (T1/2) of a radioactive substance are inversely related.
True or False: The half-life of a radioactive substance is the time taken for half of the original nuclei to decay.
