What is inversely related to frequency?

The relationship involving frequency and period is fundamental in wave physics. The period of a wave is defined as the time it takes for one complete cycle to pass a given point, while frequency refers to the number of cycles that occur in one second. These two concepts are inversely related, meaning that as the frequency of a wave increases, its period decreases, and vice versa. This inverse relationship can be expressed mathematically as:

[ \text{Frequency (f)} = \frac{1}{\text{Period (T)}} ]

Thus, if you increase the frequency, the period becomes shorter because the same number of cycles occurs in less time. This is crucial in sonography and other fields that utilize wave behavior, as it informs how ultrasound waves are generated and interpreted.

In contrast, the other choices—amplitude, wavelength, and intensity—are not inversely related to frequency in the same straightforward manner. For example, wavelength is inversely related to frequency; however, the correct focus here is on period specifically, which is a direct temporal measure. Therefore, recognizing that period is the correct answer reinforces understanding of the relationships between various wave properties in sonography.