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Lesson 8

The Photoelectric Effect

1. GOAL



To discover the ways in which light behaves as a particle.





2. ACCESS PRIOR KNOWLEDGE

 


Consider the folllowing ideas. 

  • What do you think light is made of?
  • Does it move?
  • If so, how?
  • Does light change?
  • Can we accurately measure light? 
  • Are there different types of light?



3. NEW INFORMATION

 


Watch the following video:

Photoelectric Effect (2 min)

4. APPLICATION TASK



Use the FarLab Interactive The Photoelectric Effect Experiment (see NOTE, below) to investigate the particle-like behaviour of light and the impact of this on the development of quantum mechanics.


NOTE: Prior to the lesson your teacher must make a booking with FarLabs and ensure that computer/mobile devices are able to run the program. 

5. GOAL REVISITED



As a class discuss your experiment results and summarise the evidence that demonstrates the particle-like nature of light.


Watch the following video:

5. HOMEWORK TASK



Use the PhET Interactive Program 'Photoelectric Effect' to complete the worksheet (see below) modelling the particle-like behaviour of light. This applet is designed for students to observe how light can knock electrons off a metal target and recreate the experiment that spawned the field of quantum mechanics.


You can access the following links for additional help: