DP Physics (first assessment 2025)

Question 23M.2.HL.TZ1.8ai

Date	May 2023	Marks available	[Maximum mark: 2]	Reference code	23M.2.HL.TZ1.8ai
Level	HL	Paper	2	Time zone	TZ1
Command term	Calculate	Question number	i	Adapted from	N/A

[Maximum mark: 2]

23M.2.HL.TZ1.8ai

(i)

the work function of the surface, in eV.

[2]

Markscheme

Use of E_max = $\frac{h c}{λ} - ϕ \Rightarrow ϕ = \frac{h c}{λ} -$ E_max✓

$ϕ =$ « $\frac{h c}{λ}$ − E_max = $\frac{(6.63 \times 10^{- 34}) (3 \times 10^{8})}{(468 \times 10^{- 9}) (1.6 \times 10^{- 19})}$ − 1.81» = 0.85625 $\approx$ 0.86 «eV» ✓

Syllabus sections

E. Nuclear and quantum physics » E.2 Quantum physics

Question 23M.2.HL.TZ1.8ai

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