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IB Physics HL E 2 1 Hl Photoelectric Effect Questions

Explain HL photoelectric-effect evidence by linking photon frequency and intensity to electron emission rate, kinetic energy, current and the instantaneous response.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • explain photoelectron emission using photons, including why emission is instantaneous and why electron rate depends on intensity while electron energy depends on frequency
  • interpret photocell current–voltage graphs, including saturation current, stopping potential and changes caused by intensity or photon energy
  • explain how photoelectric observations challenge wave theory and support quantized light, including applications such as charge-coupled devices

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Study E.2.1 (HL)—Photoelectric effect conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL E 2 1 Hl Photoelectric Effect Questions question 1

[Maximum number: 4]

This question is in two parts. Part 1 is about photoelectricity. Part 2 is about electrical and magnetic force fields.
Part 1 Photoelectricity

Question (a)

(a)

The diagram shows part of an experimental arrangement used to investigate the photoelectric effect.

Figure for Question (a) — IB Physics HL
[ 2 ]

Question (i)

(i)

On the diagram, draw the power supply and other necessary components needed in order to carry out the experiment in (b)(i).

[ 2 ]

Question (b)

(b)

In an experiment, light at a particular frequency is incident on a surface and electrons are emitted. Explain what happens to the number of electrons emitted per second when the intensity of this light is increased.

[ 2 ]
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