Nasty quantum physics, messing up the whole wave model and confusing everyone. Have no fear though - this worksheet deals with the photoelectric effect, keeps it simple and shows just how elegant and sensible quantum theory can be. Where the wave model fails, the idea of photons comes to the fore. This DOUBLE SIDED worksheet tests student's understanding of all aspects of this difficult concept from explaining it in extended responses to dealing with Einstein's formula and using joules and electron volts. Complete with DETAILED ANSWERS for all questions, this worksheet will keep even the most annoying, I mean able, students occupied and enthralled. Science Geeks - helping Physics teachers everywhere. Enjoy.