Fig. 11.1 depicts apparatus used to examine how a magnetic field changes the route of a beam of $\gamma$-rays. The labels shown are: source of $\gamma$-rays, thick lead plates, shaded region, beam of $\gamma$-rays, and $\gamma$-ray detector.
(a(i))[1]
Suggest what the two lead plates are meant to do.
(a(ii))[3]
State and explain what happens to the reading of the detector.
(b)[3]
State the relative ionising effects of $\alpha$-particles, $\beta$-particles and $\gamma$-rays. Suggest an explanation for the differences.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “forms a narrow beam of γ-rays / absorbs stray rays” …