A radioactive source emits both alpha (α\alphaα) particles and beta-minus (β−\beta^-β−) particles with the same initial kinetic energy into a uniform magnetic field directed into the page. The resulting trajectories of the particles are shown as Path X and Path Y in the diagram below.
Which row correctly identifies Path X and Path Y, and compares their radii of curvature rPath Xr_{\text{Path X}}rPath X and rPath Yr_{\text{Path Y}}rPath Y?
Path X is β−\beta^-β−, Path Y is α\alphaα, and rPath X<rPath Yr_{\text{Path X}} < r_{\text{Path Y}}rPath X<rPath Y
Path X is α\alphaα, Path Y is β−\beta^-β−, and rPath X<rPath Yr_{\text{Path X}} < r_{\text{Path Y}}rPath X<rPath Y
Path X is β−\beta^-β−, Path Y is α\alphaα, and rPath X>rPath Yr_{\text{Path X}} > r_{\text{Path Y}}rPath X>rPath Y
Path X is α\alphaα, Path Y is β−\beta^-β−, and rPath X>rPath Yr_{\text{Path X}} > r_{\text{Path Y}}rPath X>rPath Y