Please answer 5 & 6

5) (4p) Ultrasound therapy might be used to relieve pain, as it deposits energy in deep tissue. The warming effect encourages healing by increasing metabolism at the cellular level. In muscles, the speed of ultrasound is 1580 m/s. If an ultrasound frequency of 10 53 MHz is used, what is the wavelength of that ultrasound in the muscle tissue? 6) (5p) A very experienced diver works at a depth of 47 m below the surface of seawater. Calculate the absolute pressure at such a depth. Assume the density of the seawater is 1020 kg/m3. Give your answer in Pa with 3 significant figures. 7) (5p) You have three beakers, each filled with a fluid of a different density (see figure). You measure the apparent weight of a cube made from a unknown metal when it is fully submerged in each of the three liquids. (The same cube in each case). Predict how the three measurements compare. A B C O A = B = C PA = 1.3-9 mi PB = 0.9 9 PC = 1.0 9 O A > C > B ml ml OB > C> A O Other