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Radioactivity

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Question 40

Beta-plus (β+\beta^+β+) particles may be emitted by unstable nuclei.

a.

When an unstable nucleus decays by emitting a β+\beta^+β+ particle, its atomic (proton) number

  • A increases by 1
  • B stays the same
  • C decreases by 1
  • D decreases by 2
[1]
b.

When an unstable nucleus decays by emitting a β+\beta^+β+ particle, its mass (nucleon) number

  • A increases by 1
  • B stays the same
  • C decreases by 1
  • D decreases by 4
[1]
c.

Compared to a gamma (γ\gammaγ) ray, a β+\beta^+β+ particle

  • A has less charge
  • B has greater penetrating power
  • C causes more ionisation
  • D has less mass
[1]
d.

Describe how a student should measure the corrected count rate of a radioactive gamma source using a Geiger-Müller (GM) detector.

[4]

Radioactivity Questions

  1. IGCSE
  2. /Physics
  3. /Radioactivity