Quelpr
6 marksAtomic Structure

CAPE Physics Unit 2 · May/June 2025 · Paper 2 · Question 3(a)(i)

This question explores radioactivity and atomic structure.

Use an annotated diagram to describe the Geiger-Marsden α-particle scattering experiment.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 3(a)(ii)Using the results from this experiment, state the TWO major conclusions regarding the nuclear model of the atom.[2 marks]
  2. 3(b)(i)Complete Column 3 and Column 4 of Table 2.[2 marks]
  3. 3(b)(ii)On the grid provided in Figure 5 on page 17, plot a graph of ln (A/A₀) versus time, t. Draw the line of best fit through the points.[4 marks]
  4. 3(b)(iii)Determine the gradient of the graph in (b)(ii) and use it to find the half-life of Technetium-99m.[5 marks]
  5. 3(b)(iv)Use your results from (b)(iii) to calculate the time, t, required for the activity in the patient's body to decrease to one per cent of its value at the time…[4 marks]
  6. 3(b)(v)Express the activity in disintegrations per second when the activity has decayed to one per cent of its initial value.[1 mark]
  7. 3(b)(vi)State TWO properties of radioactive tracers that make them suitable for use in nuclear imaging.[2 marks]
  8. 3(c)Technetium-99m emits gamma-ray photons of energy 140 keV. Calculate the wavelength of these photons.[4 marks]

More practice: the rest of this paper · more Atomic Structure questions · all CAPE Physics Unit 2 past papers