We looked at the photoelectric effect this week. I’ve been looking for some video demonstrations but there are very few explanations that I would be happy to recommend. The animation I used in class is available here. I also found a nice demonstration on youtube (see below) that uses a different type of electroscope to indicate the presence of charge.
httpv://www.youtube.com/watch?v=RR4T1IlM2Jw
This video is also attached as a podcast.
Podcast: Play in new window | Download