[填空题]
(a) Determine the length o b auc2v xq93:4jrrb:rnr45tof an open organ pipe that emits z r :l3cyhx zcigl) 0ty.voi..7/a1 jkmiddle C (262 Hz) when the temjo7yazl1h .cvizi)kr.c0:gl/x 3.ytperature is 21 $^{\circ} $ C. m
(b) What are the wavelength and frequency of the fundamental standing wave in the tube? Hz m
(c) What are $\lambda$ and $f$in the traveling sound wave produced in the outside air? Hz m