Am I? 7 octaves above 400nm is 3-4nm, somewhere between extreme UV and x-ray. 7 octaves below 700nm is about 0.7mm - the end of IR and beginning of microwave sp

Am I? 7 octaves above 400nm is 3-4nm, somewhere between extreme UV and x-ray. 7 octaves below 700nm is about 0.7mm - the end of IR and beginning of microwave spectrum. Unless I'm really missing something in my calculations.