This is a design of a 10MHz US Transducer. (1) Calculate the thickness of the PZT element. (2) What should be the acoustic impedance of the backing layer (tungsten-loaded epoxy)? (3) What should be the acoustic impedance of the matching layer? Assume the transducer is used in water. (4) What should be the thickness of the matching layer? (5) Assume the diameter of this flat transducer is 1cm. What would be the length of its near field? (6) If an acoustic lens (D=1cm and F=4cm) is added to the front of this transducer, what would be the beam width at the focus? (7) In order to achieve 1mm axial resolution in biological tissues with this transducer, what should its maximum spatial pulse length be? Assume the speed of sound in biological tissue is 1500m/s