cube is shifted to a depth of 100 m in a lake. The change in volume is 0. 1%. The bulk modulus of the material is nearly

10 m column of water exerts nearly 1 atmosphere pressure. So,100 m column of water exerts nearly 10 atmosphere pressure, i.e., 10×10−5Pa or 106Pa.  Now, K=(ΔP)VΔV=106×1000.1Pa=109Pa