Question: 4 . ( 1 0 pts . ) ( a ) What must be the thickness of , and the speed of sound in ,

4.(10 pts.)(a) What must be the thickness of, and the speed of sound in, a plastic layer having a density of \(1500\mathrm{~kg}/\mathrm{m}^{3}\) if it is to transmit plane wave at 20 kHz from water into steel with no reflection? (b) What would be the intensity reflection coefficient back into water for normally incident waves impinging on an infinitely thick layer of this plastic?
4 . ( 1 0 pts . ) ( a ) What must be the

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