Physics 9702 · AS & A Level · Production and use of X-rays
Production and use of X-rays — practice question
Two metal plates, X and Y, are arranged parallel to one another and are $0.041\,\text{m}$ apart, as illustrated in Fig. 6.1. The space between them is a vacuum. An electron starts from rest at the middle of plate X. When a potential difference (p.d.) of $58\,\text{kV}$ is applied across the plates, the electron accelerates towards plate Y.
(a)[1]
Use the symbols $+$ and $-$ on Fig. 6.1 to show which of plates X and Y is positive and which is negative.
(b(i))[2]
Calculate the electric field strength $E$ between the plates. Include a unit in your answer.
(b(ii))[2]
Determine the acceleration of the electron.
(c(i))[3]
Show that the minimum wavelength of these electromagnetic waves is $21\,\text{pm}$.
(c(ii))[1]
State the region of the electromagnetic spectrum that contains these waves.
(c(iii))[2]
Explain how these electromagnetic waves may be used to form images of internal body structures.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “plate X negative and plate Y positive” …