If an ultrasound wave moves from one tissue to another tissue in the body, which of the following transitions will result in the largest change in the wavelength of the ultrasound wave

The largest change in wavelength of an ultrasound wave will occur when the wave transitions from a medium with a lower speed of sound to a medium with a higher speed of sound. Therefore, the transition from a tissue with a lower speed of sound to a tissue with a higher speed of sound will result in the largest change in wavelength.