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八年级物理上册4.2_4.3乐音与噪声练习2无答案新版北师大版20190122420.doc

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1乐音与噪声如图所示，你见过这种装置吗？从图中你看出什么？这符合环保要求吗？答 案图中装置为噪声监测设备，可以看出此时声音等级为 58.60 分贝，从课本中可以查出，此声音等级属“较静”，对人比较适宜点拨：本题中的噪声监测器不太常见，且综合了声音的等级和人的主观感觉

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