5297226
Description
Flashcards by Sarah Collinson, updated more than 1 year ago
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Created by Sarah Collinson
over 8 years ago
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| Question | Answer |
| What do the numbers on a chemical symbol represent? | - Top number - mass number - Bottom number - atomic number (proton number) |
| How is an alpha particle represented? | ⁴₂α or ⁴₂He |
| How is a beta particle represented? | ⁰₋₁β or ⁰₋₁e |
| What happens to the mass and atomic numbers during alpha decay? | - Mass number decreases by 4 - Atomic number decreases by 2 |
| What happens to the mass and atomic numbers during beta decay? | - Mass number stays the same - Atomic number increases by 1 |
| What is half-life? | The time taken for half of the radioactive nuclei to decay |
| Give a use of alpha radiation and how it works | Smoke alarms - alpha radiation ionises air particles to allow a current to flow. When smoke is present, the current drops and the alarm sounds |
| Give a use of beta radiation and how it works | Thickness monitoring - if too many particles get through the paper or foil, the rollers apply less pressure and vice versa |
| Give a use of gamma radiation and how it works | Medical tracers - a patient injects or swallows the source, and its movement is measured by external detectors |
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