To increase the transmittance of the wave received by the piezo transducer, it is connected to the medium under study through a special spacer. The density and speed of sound in the medium under study are equal to ρ1 and c1 respectively, the density and speed of sound in the gasket and the piezo-sensor crystal are equal to ρ2, c2 and ρ3, c3 respectively. Let ρ2c2ρ1c1=ρ3c3ρ2c2=4. Compare in terms of power the signals arriving at the sensor with and without the pad, if the duration of the signal is shorter than the time of its passage through the pad.