用嘴对着试管口部吹气,振动的物体是空气柱,试管中盛水越多,空气柱越短,越容易振动,频率越大,音调越高.
当用手指润湿后沿着杯口边缘摩擦时,是杯子和水发生了振动,当水量越大时,杯子和水越难振动,因此可以得出杯中的水量越大,音调越低,水量越小,音调越高.
故答案为:空气柱;升高;降低.
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