The impedance of a material is z=rhoc, the density times the speed of sound. consider the following information: zlung=0.18×106kg s/m2.zfat=1.34×106kg s/m2.what fraction of the incident intensity of a sound pulse will be reflected when sound travels from fat into lung?

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.