∙ULF (ultra low frequency) electromagnetic waves, produced...

$\bullet$ ULF (ultra low frequency) electromagnetic waves, produced in
the depths of outer space, have been observed with wavelengths in
excess of 29 million kilometers. What is the period of such a wave?

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Key Concepts

Speed of Light

Electromagnetic waves propagate at a constant speed in a vacuum, known as the speed of light (approximately 3 x 10^8 meters per second). This constant is vital in calculations involving the wavelength and frequency of electromagnetic radiation, linking the spatial extent of a wave to its temporal characteristics.

Wavelength-Frequency Relationship

The fundamental relationship between wavelength and frequency is given by the equation f = c/?, where f is the frequency, c is the speed of light, and ? is the wavelength. This relationship shows that as the wavelength increases, the frequency decreases, which is particularly important when analyzing ultra low frequency electromagnetic waves with extremely long wavelengths.

Wave Period

The period of a wave, defined as the time required to complete one full cycle, is the inverse of the frequency (T = 1/f). Understanding this concept allows one to determine how long each cycle takes, based directly on the wave's frequency, which can be calculated from the wavelength using the speed of light.

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