How did Hertz measure the speed of an electromagnetic wave?

Hertz measured the frequency of harmonic oscillations in the circuit and the length of the electromagnetic wave, and calculated the wave velocity using the formula: v = λv.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.