[填空题]
A particular organ pipe can resonate at 264ns.8 mva(wr37 ro3giz8re( 9i ghjzt( Hznfkowkm;z 3 .7, 440 Hz, and 616 Hz, but not at any other frequencies in between. (a) Show nkw.;7fmkz3owhy this is an open or a closed pipe. (b) What is the fundamental frequency of this pipe? Hz