iGCSE double award Radioactivity (Physics)

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1. What is the effect on the mass + atomic number on alpha on the nucleus?

  • Atomic number goes down by 2
  • Atomic number increases by 2
  • No change
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2. What is meant by the term 'half-life'

  • The time taken for radiation emitted by a source to increase by a half
  • The time taken for radiation emitted by a source, to decrease by a half
  • When only half of an atom is radioactive
  • When radioactive sources don't stay radioactive permanently

3. What is the effect on the mass + atomic number on gamma on the nucleus?

  • Increases by 4
  • No specific effect
  • Decreases by 2

4. How is the penetrating power of a gamma particle reduced?

  • With 3mm of aluminium
  • With a thick layer of lead
  • It cannot be reduced
  • With paper or air

5. What is the most common source of background radiation?

  • Weapons testing
  • Medical sources
  • Radon gas from the ground
  • Food and Drink

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