Find the incident intensity of ultrasound beam that travelled from soft to hard tissue. Given the values of acoustic impedance of soft and hard tissue are 1.4 and 7.8 kgm-2s-1, respectively, and the reflected intensity is 35 mW. Assume that the angle of incident wave is perpendicular to the surface boundary.

Find the incident intensity of ultrasound beam that travelled from soft to hard tissue. Given the values of acoustic impedance of soft and hard tissue are 1.4 and 7.8 kgm-2s-1, respectively, and the reflected intensity is 35 mW. Assume that the angle of incident wave is perpendicular to the surface boundary.