A certain particle is sent into a uniform magnetic eld, with the particle's velocity vector perpendicular to the direction of the eld. The gure gives the period Tof the particle's motion versus the inverse of the eld magnitude B. The vertical axis scale is set by T5= 28.1 ns, and the horizontal axis scale is set by BS4: 7.3 Ti. What is the ratio m/q of the particle's mass to the magnitude of its charge? T013)