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Radioactivity
Question | Answer |
---|---|
Define radioactivity | Spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation |
Properties of Alpha particles | Helium nuclei. Affected my electric fields. Stopped by a sheet of paper. |
Properties of Beta particles | Electrons. Affected by electric fields. Stopped by 5mm of aluminium. |
Properties of Gamma rays | Waves of high energy. Unaffected by electric fields. Stopped by several cm of lead. |
Properties of nuclear reactions | Change takes place in nucleus. A new element is formed. Nuclear radiation is released. No chemical bond breaking or formation. |
Define half life | The time taken for half of the nuclei in a sample to decay |
Define radioisotope | A radioactive isotope |
Uses of radioactivity | Medical uses. Archaeological uses. Agricultural research. Food irradiation. Smoke alarms. Industrial uses. |