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3 marksRadioactive Emissions

CSEC Physics · 2021 · Paper 2 · Question 6(b)(i)

A Radium-226 nucleus decays by α-particle emission to Radon (Rn) nucleus.

Explain what is meant by the term 'radioactivity'.

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Other parts of this question

  1. 6(a)(i)For a neutral atom of Radium-226, state the number of protons.[1 mark]
  2. 6(a)(ii)For a neutral atom of Radium-226, state the number of neutrons.[1 mark]
  3. 6(a)(iii)For a neutral atom of Radium-226, state the number of electrons.[1 mark]
  4. 6(b)(ii)Complete the equation for the decay of Radium-226: ²²⁶₈₈Ra ->[2 marks]
  5. 6(c)(i)Define the term 'half-life'.[2 marks]
  6. 6(c)(ii)At a certain time, a sample contains 8.0 × 10⁸ Radium nuclei. Calculate the number of α-particles emitted by the Radium nuclei in the next 4800 years.[4 marks]
  7. 6(c)(iii)How much more time will elapse before the number of Radium nuclei remaining falls to 0.5 × 10⁸?[1 mark]

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