DP Physics (first assessment 2025)

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Question 22N.1A.HL.TZ0.37

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.HL.TZ0.37
Level HL Paper 1A Time zone TZ0
Command term Question number 37 Adapted from N/A
37.
[Maximum mark: 1]
22N.1A.HL.TZ0.37

Monochromatic electromagnetic radiation ejects photoelectrons from a metal surface. The minimum frequency for which this is possible is f.

When radiation of frequency 2f is incident on the surface, the kinetic energy of the photoelectrons is K.

What is the kinetic energy of the photoelectrons when the frequency of the radiation is 4f?


A.  K

B.  2K

C.  3K

D.  4K

[1]

Markscheme

C

Examiners report

A difficult but well discriminating question. The relationship between the KE of the photoelectrons and photon frequency is not directly proportional which eliminates alternative B (the most popular but incorrect answer). A sketch graph of KE against frequency helps to identify the correct answer, e.g. by considering the increase in KE over equal frequency intervals of length f.

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