DP Physics (first assessment 2025)

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Question 21M.2.HL.TZ1.c

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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
c.
[Maximum mark: 3]
21M.2.HL.TZ1.c

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=6.63×10-34×3×1083.7×1.6×10-19 ✓

=3.4×10-7 m OR 340 nm ✓


Must see an appropriate unit to award MP3.

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