Which property of a 2.3 MHz ultrasound wave remains unchanged in human tissues?

• A. Frequency
• B. Wave speed
• C. Amplitude
• D. Wavelength

Answer: (A)

The frequency of the ultrasound wave remains unchanged as it travels through human tissues. This is an essential concept in the propagation of waves. When a wave travels from one medium to another, the frequency is determined by the source of the wave and does not change. This is in contrast to properties such as wave speed and wavelength, which can vary depending on the medium.

In the case of ultrasound moving through human tissues, while the wave speed may change due to the differing densities and elastic properties of the tissues, the frequency remains constant at 2.3 MHz. The amplitude of the wave can also change as it interacts with tissues, often diminishing due to absorption and scattering, but frequency is a fundamental property that stays the same during the transmission of the ultrasound wave.

Thus, understanding that frequency is invariant in this context is crucial in fields such as medical imaging, where the frequency of the ultrasound determines the characteristics of the image being produced.