Answer 2 questions plz

Calculate the reflected percentage of an ultrasound wave passing from human muscle into bone. Muscle has a typical density of 1.06 x 105 kg/m3 and bone has a typical density of 1.85 x 103 kg/m3. HINT % Need Help? Read It [-/1 Points] DETAILS SERCP11 14.5.P.010. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A person standing 1.15 m from a portable speaker hears its sound at an intensity of 7.90 x 10-3 w/m2. HINT (a) Find the corresponding decibel level. dB (b) Find the sound intensity (in W/m ) at a distance of 42.0 m, assuming the sound propagates as a spherical wave. w/m2 (c) Find the decibel level at a distance of 42.0 m. dB Need Help? Read It Watch It