Available practice: 94 of 100 marks. Parts 3(a)(i), 7(a), 8(a) await marking support. Scores cover available parts only.
Fig. 8.1 shows a tube in which X-rays are produced at a metal target. Particles are accelerated from the filament to the target by a constant high voltage applied across the terminals X and Y.
(b)(i)State the name of the particles.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
In an X-ray tube, particles are accelerated from a heated filament to a metal target by a constant high voltage applied across terminals X and Y, where X is connected to the filament side and Y to the target side .
(b)(ii)On Fig. 8.1, use + and – signs to label terminals X and Y to indicate the polarity of the high voltage.
[1 mark]
(c)(i)In the X-ray tube of Fig. 8.1, electrons are accelerated from the filament to the metal target by a constant high voltage. For an accelerating voltage of 32 kV, determine the maximum energy, in MeV, of an X-ray photon produced at the target.
[1 mark]
In the X-ray tube of Fig. 8.1, electrons are accelerated through a voltage of 32 kV onto a metal target.
(c)(ii)Determine the maximum momentum of an X-ray photon produced at the target.
Answer guidance
Determine Work it out from what you are given or from the figure, and show how you got there.
[2 marks]
(c)(iii)Determine the minimum wavelength of X-rays produced at the target.
Answer guidance
Determine Work it out from what you are given or from the figure, and show how you got there.
[3 marks]
(d)Explain why X-rays can be used to produce images of internal body structures that have good contrast.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[3 marks]
9702/41/M/J/24Cambridge International AS & A Level Physics 9702 · May/June 2024 · Paper 4 variant 1 · Question 8
