Edexcel IGCSE Physics: Double Science 复习笔记：7.3.5 The Conditions for Fusion Fusion in Stars Stars are huge balls of (mostly) hydrogen gas In the centre of star, hydrogen atoms undergo nu...
Edexcel IGCSE Physics: Double Science 复习笔记：7.3.4 Nuclear Fusion Nuclear Fusion Small nuclei can react to release energy in a process called nuclear fusion Nuclear fusion is defined as: ...
Edexcel IGCSE Physics: Double Science 复习笔记：7.3.3 Nuclear Reactors Chain Reactions Only one extra neutron is required to induce a uranium-235 nucleus to split by fission During the fissi...
Edexcel IGCSE Physics: Double Science 复习笔记：7.3.2 Nuclear Fission Nuclear Fission Nuclear fission is defined as: The splitting of a large, unstable nucleus into two smaller nuclei...
Edexcel IGCSE Physics: Double Science 复习笔记：7.3.1 Nuclear Energy Nuclear Energy The nucleus of the atom contains a huge amount of energy – roughly one million times greater than the amou...
Edexcel IGCSE Physics: Double Science 复习笔记：7.2.5 Dangers of Radiation Dangers of Radiation Ionising radiation can damage human cells and tissues If the atoms that make up a DNA strand a...
Edexcel IGCSE Physics: Double Science 复习笔记：7.2.4 Contamination & Irradiation Contamination & Irradiation Contamination Contamination is defined as: The unwanted presence ...
Edexcel IGCSE Physics: Double Science 复习笔记：7.2.3 Uses of Radioactivity Uses of Radioactivity Radiation is used in a number of different ways: Medical procedures including diagnosis and ...
Edexcel IGCSE Physics: Double Science 复习笔记：7.2.2 Half-Life Half-Life It is impossible to know when a particular unstable nucleus will decay But the rate at which the activity of a sampl...
