Aboard that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density . the board is floating partially submerged in water of density 1000 kg/m3. what fraction of the volume of the board is above the surface of the water?

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm