The document describes a physics problem involving the identification of an unknown material based on its properties. It provides: 1) The material's speed of sound is 1450 m/s and bulk modulus is 2.85 x 1010 Pa. Using these values, the element is identified as mercury. 2) A 1300 Hz sound wave with power of 1.2 x 10-12 W is used. Calculations show the sound intensity is 6.7906 x 10-9 W/m2 and amplitude is 3.07 x 10-10m. 3) The decibel level is calculated to be 38.32 dB using the reference intensity of 10-12 W/m2.