Revision: Radioactivity Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 21 Radioactivity - Revision Quiz Test your understanding of Radioactivity here: 1 / 5 1) The table shows the results of an experiment to find the half-life of a radioactive substance. What is the half-life of the substance? 180 s 240 s 120 s 60 s 2 / 5 2) A radioactive nucleus emits a β-particle. What happens to the proton number (atomic number) of the nucleus? It decreases by 4. It increases by 1. It stays the same. It decreases by 2. 3 / 5 3) Radioactive decay is stated to be random in nature. Which statement best describes what is meant by this? It is impossible to know what type of emission a particular radioactive nuclide will emit. It is impossible to predict when a particular radioactive nucleus will decay. It is impossible to know in which direction a radioactive particle will be emitted. It is impossible to predict which radioactive nucleus will be the next to decay. 4 / 5 4) The diagram below shows nucleon number against proton number. The nucleus Bismuth-212 is plotted on the graph at the cross marked P. Which point on the diagram would represent the new nucleus after the Bismuth-212 decays by emitting an alpha particle? A D B C 5 / 5 5) All radioactive sources have a half-life. Which statement about the half-life of a source is correct? It is the time it takes the activity of the source to decrease by half It is half the time it takes for an atom to decay It is half the time it takes the activity of the source to decrease to zero It is half the time for the radioactive source to become safe Your score is Restart quiz
