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2.5 marksHalf-life

CSEC Physics · 1996 · Paper 2 · Question 3(b)(ii)

Table 1 gives the half-lives of three radioactive isotopes of carbon. Figure 5 shows the decay curve for 4 g of carbon-10.

On Figure 5, draw the decay curve for 4 g of carbon-15. Label the graph clearly.

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Other parts of this question

  1. 3(a)Complete the diagram to show the correct number of electrons in the outer shell of the atom.[1 mark]
  2. 3(a)(i)State the name of the other particles in the nucleus.[1 mark]
  3. 3(a)(ii)The nuclide can be represented by the symbol ^A_Z C. State what A is known as and give its value.[2 marks]
  4. 3(a)(iii)State what Z is known as and give its value.[2 marks]
  5. 3(b)(i)On Figure 5, draw the decay curve for 4 g of carbon-14. Label the graph clearly.[2.5 marks]
  6. 3(c)(i)Calculate the difference in mass between nuclei of carbon-14 and nitrogen-14.[1 mark]
  7. 3(c)(ii)Determine the energy released when one carbon-14 nucleus decays. (c = 3.00 × 10⁸ m s⁻¹)[3 marks]

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