描述: 射电波是电磁波谱中波长最长、频率最低、能量最低的部分。它们的波长最短约为1毫米，对应频率为300千兆赫，波长最长可达数公里，对应频率为兆赫。我们的大气层对这一波段的大部分是透明的，因此可以在地面上架设射电望远镜。

相关词条

• 电磁辐射
• 微波辐射
• 射电望远镜

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