The tau particle is a negatively charged particle similar to the electron, but of much larger mass its mass is 3.18 x 102 kg about 3480 times the mass of the electron and about twice the mass of a proton or neutron. nuclear material is transparent to the tau; thus the tau can orbit around inside a nucleus, under the infuence of attracton of the nuclear charge. suppose the ) tau is in a circular orbit of radius 2.9 x 10-15 m inside a uranium nucleus. treat the nucleus as a sphere of radus 7 4x 10-18 m with charge 92e uniformly distributed throughout its volume find the speed of the orbital motion of the tau note that the charge of the tau is the same as that of the electron select one a 5.88 x 107 m's b. 1.18 x 107 m's c. 2.75 x 10 m/'s d. 5.90 x 10 m/s e. 3.51 x 10 m's