Please Show all the work for part a and b

a. A solute atom of radius r0(1+) in a cavity of radius r0 Consider the strain to be +ve. Prove that the volume change, V4r03 b. The expression for the hydrostatic component of the stress field is given as p=11+3rGbsin From the two expressions first obtain an expression for misfit energy and then obtain the expression for the force that is being exerted by the dislocation on the solute. In your expression Force should be proportional to r2sin