Modulus Material (x10°Pa) Density (x10³kg/m³) air (20°C) .0001420032 0.0012 fat 2.00 0.9517 water (50°C) 2.19 1.0000 human soft tissue 2.51 1.0584 brain 2.43 1.0253 liver 2.56 1.0652 kidney 2.53 1.0378 kidney stone 7.95 1.365 blood 2.44 1.0606 muscle 2.69 1.0726 lens of eye 2.98 1.1358 skull-bone 31.8 1.9118 brass 173 8.6000 titanium 167 4.4800 5) Baylee is performing an ultrasound scan. The scanner sends a signal of frequency 4.25MHz that enters the liver from blood. Liver has an attenuation coefficient of 0.17dẞ/cm-MHz. Determine a) the speed of the sound wave in liver, b) the angle of refraction into liver, given the signal is incident at an angle of 37.2° as it enters the liver from blood, c) the reflection coefficient, R, of the signal between blood and liver. d) the wavelength of the sound wave in liver, e) the penetration depth of the signal in liver when its signal intensity, la, is 15% of its original signal intensity, lo. f) the time, in us, it takes for the signal to travel the distance found in part (e), g) the change in relative intensity, in dẞ, due to factor of change of la/le as stated in part (e).