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什么叫频率、波长和周期? 频率、波长、周期是表示电磁辐射的物理参数,代表了电磁波的性质。频率是单位时间内振动的次数。交流电在导体内每一秒钟所振动的次数。交流电频率的单位
What is frequency, wavelength and period? Frequency, wavelength and period are the physical parameters that represent electromagnetic radiation and represent the nature of the electromagnetic wave. Frequency is the number of vibrations per unit time. The number of times alternating current vibrates within the conductor every second. Unit of AC frequency