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直观表象教学在物理教学中有重要作用,高中物理教材介绍了可以利用Audacity软件进行声波教学.笔者利用这款软件在“超声波和次声波”教学中,先从10kHz,逐渐降低频率,直至20Hz以下,此时就会分别感受到音调不断降低,有人在不到20Hz时就已经听不到;同理逐渐增加频率,直至20000Hz以上,有人在不到20000Hz时就已经听不到.学生自然便会形成表象.
Visual appearance teaching plays an important role in physics teaching, high school physics teaching materials can introduce the use of Audacity software for acoustic teaching.The author uses this software in “ultrasonic and infrasound ” teaching, first from 10kHz, gradually reduce the frequency until 20Hz The following, at this time will feel the tone continue to decline, some people have not heard less than 20Hz; the same reason gradually increase the frequency until more than 20000Hz, some people have not heard when less than 20000Hz. Will form an appearance.