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初中物理教师在教学过程中常常会碰到这类题目:题目如图1所示,相同的瓶子里装入了不同的水量,用棒敲击瓶子时,可发出不同音高。那么发出的声音音调从左至右是__,发声体是__。
Junior high school physics teachers often encounter such problems during the teaching process. The problem is shown in Figure 1. The same bottle is filled with different amounts of water. When the bottle is struck with a stick, different pitches can be emitted. The tone of the sound emitted is __ from left to right and the sounding body is __.