The best description of the relationship between wavelength and frequency in an electromagnetic wave is inversely proportional.
As the frequency of the wave increases, the wavelength decreases, and vice versa. This relationship can be expressed by the equation:
\[ c = \lambda \cdot f \]
where \( c \) is the speed of light, \( \lambda \) is the wavelength, and \( f \) is the frequency. Since the speed of light is constant, an increase in frequency results in a decrease in wavelength, indicating their inverse relationship.
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