measure word · hertz (Hz), unit of frequency

这个信号的频率是五十赫兹。

measure word · the SI unit of frequency, equal to one cycle per second (Hz)

这台电脑显示器的刷新率是六十赫兹。

proper name · Heinrich Hertz (1857-1894), German physicist and meteorologist, pioneer of electromagnetic radiation

赫兹在十九世纪证实了电磁波的存在。