What else changes with a change in amplitude?

When amplitude is changed in an ultrasound wave, the output power is directly affected. The amplitude of an ultrasound wave is related to the strength of the signal, which in turn influences the output power produced by the ultrasound system.

An increase in amplitude will result in a higher output power because power is proportional to the square of the amplitude (Power ∝ Amplitude²). Conversely, if the amplitude decreases, the output power is also reduced. Therefore, adjustments made to the amplitude of the sound wave directly correspond to changes in the energy transmitted into the tissue.

The other options, such as frequency, pulse repetition frequency, and wavelength, do not directly change with variations in amplitude. Frequency is determined by the characteristics of the transducer and the sound wave itself, while pulse repetition frequency relates to the rate at which pulses are emitted and is not dependent on amplitude changes. Wavelength is determined by the speed of sound in the medium and the frequency of the wave, making it independent of amplitude alterations.