I think he is
or his just panicking veeery badly
but I don't mind. he's actually forcing me to actually revise this stuff 3 weeks before the exam, while I'm revising eng and maths.
I was planning to do it like...after maths
think of a photon LIKE a particle, even though its not really. they are able to move like a particle, and instead of having a singular mass, they are just a 'ball' or energy. that 'ball' moves in a wave like motion, so has a frequency associated with it. that's all it means really