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Physics (AS & A Level) · Feb / March 2017 · Paper 12 · Question 38

9702Atoms, nuclei and radiation

Which row describes the relative ionizing power and the relative penetration power per unit length in air of α-particles and γ-rays?

  1. Aα-particles: least ionizing; γ-rays: least penetrating
  2. Bα-particles: least penetrating; γ-rays: most ionizing
  3. Cα-particles: most ionizing; γ-rays: most penetrating
  4. Dα-particles: most penetrating; γ-rays: least ionizing

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Correct answer: C. α-particles: most ionizing; γ-rays: most penetrating

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