DP Physics (first assessment 2025)

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Question 19N.2.HL.TZ0.11b(i)

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.2.HL.TZ0.11b(i)
Level HL Paper 2 Time zone TZ0
Command term Calculate Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 3]
19N.2.HL.TZ0.11b(i)
(b(i))

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

[3]

Markscheme

ϕ=hcλ-EK ✔

EK=1.5«eV» ✔

ϕ=«1.24×10-6480×10-9-1.5=» 1.1 «eV»✔

NOTE: Allow reading from the graph of Ek=1.4leading to an answer of 1.2 «eV».

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