I originally wrote this as a unit of work to go with ISAs, which were the way that practical work was assessed on the 2009 specification. I think I now have an idea what the 2016 specification is after, and have rewritten this project to reflect the changes, hopefully I am not too far from what the examiners are thinking.
Both my old (Beithaupt) and my new textbook (England etc) for AQA AS Physics seem to like to do particles in the opposite order from tradition. The trouble with this is you are talking about photons before you’ve explained where the idea comes from. I’m afraid I’m traditional and like to teach it from a historical point of view. To that end I follow this timeline:
When I get towards the photoelectric effect I follow the history as laid out by Klassen:
I illustrate the history with an apparatus diagram from Von Lenard’s Nobel Lecture:
And the graph that Millikan produced when trying to disprove it, from his Nobel Lecture:
And although not strictly in the A level, having introduced De Broglie, I like to go through the Bohr atom as well: