ហេនរីច ហឺត៖ ភាពខុសគ្នារវាងកំណែនានា
ខ្លឹមសារដែលបានលុបចោល ខ្លឹមសារដែលបានសរសេរបន្ថែម
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បន្ទាត់ទី៤៤៖
In more advanced experiments, Hertz measured the velocity of electromagnetic radiation and found it to be the same as the light’s velocity. He also showed that the nature of radio waves’ reflection and refraction was the same as those of light and established beyond any doubt that light is a form of electromagnetic radiation obeying the Maxwell equations.
Hertz's experiments would soon trigger the invention of the [[wireless telegraph]], [[radio]], and later [[television]]. In 1930 the [[International Electrotechnical Commission]] (IEC) recognized his work by naming the unit of frequency—one cycle per second—the "[[hertz]]".<ref name="hertzunit">[http://www.iec.ch/about/history/overview/ IEC History]. Iec.ch.</ref>
===Meteorology===
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