(а). A medicаl ultrаsоund pulse is sent intо a layer оf fat tissue in the human body. If the thickness of the fat layer is 2.5 cm and the speed of sound in the fat tissue 1450 m/s. How long does it take the sound to travel to the far side of the tissue and return to the detector? (2.0 points) (b). While conducting a field experiment in a desert environment, a physics student measures the speed of sound by creating a sharp clap and timing the echo from a distant rock wall. After several trials, the average measured speed of sound was 356 m/s. Determine the air temperature in the desert at the time of the measurement. (1.5 points)