Question 2 a) For a hollow sphere with external radius r, of 8.0 and internal radius ra of 6.5, determine the volume using the following equation. Note use pi for m b. The resonant frequency f (inHz) for a circuit is given by Calculate the resonant frequency when L = 0.2 henrys, R-1500, R2= 1800 ohms, C-2x108 farads