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写字的铅笔是物理实验中最简易、最方便的器材,下面列举数例并略加分析。1.探究声音的传播将铅笔一端放在口中,轻轻敲笔杆几下,再用牙齿咬住笔杆轻敲笔杆几下。发现后者的声音比前者大得多。因为前者声音是经过
Writing pencils are the easiest and most convenient equipment in physics experiments. The following examples are listed and analyzed slightly. 1. Exploring the propagation of the sound Place one end of the pencil in the mouth, tap gently on the penholder, and then use your teeth to bite the penholder and tap the penholder a few times. Found that the latter’s voice is much larger than the former. Because the former sound is passed