DP Physics (first assessment 2025)

Question 21M.2.HL.TZ2.9c

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.HL.TZ2.9c
Level	HL	Paper	2	Time zone	TZ2
Command term	Calculate	Question number	c	Adapted from	N/A

[Maximum mark: 2]

21M.2.HL.TZ2.9c

(c)

Photons with energy 1.1 × 10⁻¹⁸J are incident on a third metal surface. The maximum energy of electrons emitted from the surface of the metal is 5.1 × 10⁻¹⁹J.

Calculate, in eV, the work function of the metal.

[2]

Markscheme

$5.1 \times 10^{- 19} = 1.1 \times 10^{- 18} - ϕ$ ✓

work function $= « \frac{(11.0 - 5.1) \times 10^{- 19}}{1.6 \times 10^{- 19}} = » 3.7 «eV»$ ✓

Award [2] marks for a bald correct answer.

Syllabus sections

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

Question 21M.2.HL.TZ2.9c

Select a Test

Syllabus sections

Confirm action