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) Which of the following is the most ionising form of radiation? they are all the same gamma alpha beta 2 / 5 2) A detector of ionising radiation gives a background rate of 24 per minute. A radioactive source is placed close to the detector and the reading is 532 counts per minute. What will be the reading after two half-lives of the source? 133 157 127 151 3 / 5 3) In a fission reactor, which particle causes a Uranium-235 nucleus to split? neutron alpha-particle gamma ray proton 4 / 5 4) What is the nature of an alpha particle? It is a fast moving electron. It is an electromagnetic wave. It is a fast moving helium atom. It is a fast moving helium nucleus. 5 / 5 5) A nucleus consists of 90 protons and 144 neutrons. After emitting two beta particles and an alpha particle, this nucleus has 90 protons and 140 neutrons 90 protons and 142 neutrons 86 protons and 142 neutrons 86 protons and 140 neutrons Your score is Restart quiz
