c f The presence of the electric field in an electromagnetic wave can be detected by measuring the voltage difference between two points on its path. This cannot be measured directly in the case of light waves; because their frequency is very high...
Turns out that the "speed" of the electromagnetic wave c is equal to the product of the frequency multiplied by the wavelength:
c = λf
The presence of the electric field in an electromagnetic wave can be detected by measuring the difference in voltage between two points on its path. This cannot be measured directly in the case of light waves because their frequency is so high that it reaches 1410 vibrations per second. A similar experiment was conducted on radio waves with a frequency of 610 vibrations per second.
By measuring these patterns, it is possible to determine the wavelength of the light used in the experiment. These measurements found that visible light (i.e., for the human eye) ranges from violet with a shorter wavelength (about 0.4 ppm) to red with a longer wavelength (about 0.7 ppm).
Another important characteristic is the intensity of the wave; in the case of light, it is what we call illumination or illumination. In technical terms, the intensity of the wave or illumination intensity is the amount of energy the wave carries per second. The intensity of the light is proportional to the square of the amplitude of the electric field, and we will use this information below.
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Source: Published on Facebook's "Braheen Center" page