DP Physics (last assessment 2024)

Question 21M.2.HL.TZ1.c

Date	May 2021	Marks available	[Maximum mark: 3]	Reference code	21M.2.HL.TZ1.c
Level	HL	Paper	2	Time zone	TZ1
Command term	Calculate	Question number	c	Adapted from	N/A

[Maximum mark: 3]

21M.2.HL.TZ1.c

In an electric circuit used to investigate the photoelectric effect, the voltage is varied until the reading in the ammeter is zero. The stopping voltage that produces this reading is 1.40 V.

The photoelectrons are emitted from a sodium surface. Sodium has a work function of 2.3 eV.

Calculate the wavelength of the radiation incident on the sodium. State an appropriate unit for your answer.

[3]

Markscheme

$E = 2.3 + 1.4$ ✓

$λ = \frac{6.63 \times 10^{- 34} \times 3 \times 10^{8}}{3.7 \times 1.6 \times 10^{- 19}}$ ✓

$= 3.4 \times 10^{- 7} m OR 340 nm$ ✓

Must see an appropriate unit to award MP3.

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 12: Quantum and nuclear physics » 12.1 – The interaction of matter with radiation

Additional higher level (AHL) » Topic 12: Quantum and nuclear physics

Question 21M.2.HL.TZ1.c

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