Discuss the ability for the wave nature of light in explaining the photoelectric effect (4 marks)
I'm guessing, since it's a discuss question, that you can draw a conclusion even if it's
different to what they're suggesting, and so say that the PE effect shows that light has a particle nature, but that other experiments (eg. cathode rays) show that it also has a wave nature, which has led to the dual nature theory. Hope that helped
(hope the picture worked, otherwise find in
http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html under wave-particle duality: light). However that is a weird question