28 A radioactive source in the form of a metal sphere of

Last updated: 6/9/2023

28 A radioactive source in the form of a metal sphere of diameter 3 2 x 10 3 m emits B particles at a constant rate of 6 25 1010 particles sec The source is electrically insulated and all the B particles are emitted from the surface The potential of the sphere will rise to 1 V in time domu c 18 s mung a 180 s b 90 s d 9 s