Plane waves in water of 100 Pa effective (rms) pressure are incident normally on a sand bottom. The sand has density 2000 kg/m³ and sound speed 2000 m/s. (a) What is the effective pressure of the wave reflected back into the water? (b) What is the effective pressure of the wave transmitted into the sand? (c) What is the power reflection coefficient? (d) What is the smallest angle of incidence at which all of the incident energy will be reflected?

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