DP Physics (first assessment 2025)

Question EXE.2.HL.TZ0.c

Date	Example questions Example questions	Marks available	[Maximum mark: 4]	Reference code	EXE.2.HL.TZ0.c
Level	HL	Paper	2	Time zone	TZ0
Command term	Predict	Question number	c	Adapted from	N/A

[Maximum mark: 4]

EXE.2.HL.TZ0.c

After passing through the circular hole the electrons strike a fluorescent screen.

Predict whether an apparatus such as this can demonstrate that moving electrons have wave properties.

[4]

Markscheme

idea that de Broglie wavelength and hole size must be similar ✓

Use of $λ = \frac{h}{\sqrt{2 m e V}}$ ✓

Leading to $λ$ around 5 x 10⁻¹¹m (which is unrealistic for a practical situation) ✓

It would not be possible to construct this hole
OR
hole must be smaller than an atom so impossible ✓

Syllabus sections