1. Two spherical stars A and B have densities PA and PB, respectively. A and B have the same radius, and their masses MA and M are related by MB = 2M. Due to an interaction process, star A loses some of its mass, so that its radius is halved, while its spherical shape is retained, and its density remains PA. The entire mass lost by A is deposited as a thick spherical shell on B with the density of the shell being PA. If and v are the escape velocities from A and B after the interaction process, the ratio VB VA 10n = 151/3 The value of n is > 2. The minimum kinetic energy needed by an alpha particle to cause the nuclear reaction 16 N + 2 He H+190 in a laboratory frame is n (in MeV). Assume that 16 N is at rest in the laboratory frame. The masses of 16 N, He, H and 190 can be taken to be 16.006 u, 4.003 u, 1.008 u and 19.003 u, respectively, where 1 u = 930 MeVc. The value of n is 3. In the following circuit C = 12 F, C = C = 4 F and C = C = 2 F. The charge stored in C3 is. C C. 6 V C5 2 V