Joel Kenyon @joel120193.substack.com ยท Jul 7 The weirdest one for me has to be this ๐ Why on earth is that on the GCSE? 1 likes 2 replies ? Reply Replies Alex Weatherall ยท Jul 7 It's there qualitatively and the reason is entirely to do with spirals. Alastair Gittner ยท Jul 7 Which bit, the n=1,2,3 or the electromagnetic radiation or both?