DP Physics (last assessment 2024)

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Question 21M.2.HL.TZ1.a

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

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.

Describe the photoelectric effect.

[2]

Markscheme

electrons are ejected from the surface of a metal ✓

after gaining energy from photons/electromagnetic radiation ✓

there is a minimum «threshold» energy/frequency
OR
maximum «threshold» wavelength ✓

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