CAIE A-Level Physics A2 22.3.2 And Interpret Qualitatively the Evidence Provided By Electron Diffraction Topic Practice

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Question 1

[Maximum number: 3]

Question (a)

(a)

Electrons accelerate through a potential difference, pass through a thin crystal and are then incident on a fluorescent screen.

The pattern in Fig. 8.1 is observed on the fluorescent screen.

Fig. 8.1 not to scale

Fig. 8.1 not to scale

[ 3 ]

Question (i)

(i)

State the name of the phenomenon shown by the electrons at the crystal.

[ 1 ]

Question (ii)

(ii)

State what this phenomenon shows about the nature of electrons.

[ 1 ]

Question (iii)

(iii)

Suggest why the thin crystal causes the phenomenon in (b)(i).

[ 1 ]
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