Hello. first, sorry for my poor English. Derive characteristic wavelength from radiation power This is radiated power from bending magnet (synchrotron storage ring accelerating electron to get x-ray) and these are wave distribution from storage ring and what I have to derive is as follows. characteristic wavelength of radiation I have to derive this equation. professor said I can derive this equation from the first power equation. I have been trying for 3 days. but couldn't find solution. help... Best regards.