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无线电波
无线电波
Licensed under Creative Commons Zero, Public Domain Dedication (Chetvorno).
无线电波（英语：Radio waves），有时也称无线电、射频等，是一种电磁波，其波长在電磁波譜中比红外线长。无线电波的頻率在300 GHz到3 kHz之间，但也有定义将任何1 GHz或3 GHz以上的电波划为微波。当频率在300 GHz时，无线电波对应的波长为1 mm（0.039英寸）；在3 kHz时，波长为100 km（62 mi）。和其他电磁波一样，无线电波也以光速行进。自然界中的无线电波主要是由闪电或者宇宙天体形成。
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This article uses material from the Wikipedia article "无线电波", which is released under the Creative Commons Attribution-Share-Alike License 3.0. There is a list of all authors in Wikipedia
