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Question 21M.2.HL.TZ2.9a.iii

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.HL.TZ2.9a.iii
Level HL Paper 2 Time zone TZ2
Command term Outline Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 1]
21M.2.HL.TZ2.9a.iii

In an experiment to demonstrate the photoelectric effect, monochromatic electromagnetic radiation from source A is incident on the surfaces of metal P and metal Q. Observations of the emission of electrons from P and Q are made.

The experiment is then repeated with two other sources of electromagnetic radiation: B and C. The table gives the results for the experiment and the wavelengths of the radiation sources.

(a.iii)

Outline why radiation B gives different results.

[1]

Markscheme

Identifies P work function lower than Q work function ✓

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