proton and an alpha particle enter a region with a strong magnetic perpendicular

Question

proton and an alpha particle enter a region with a strong magnetic perpendicular to their direction of motion. The proton has atomic mass -1 u and a charge of +1, while the alpha particle has atomic mass = 4 u and a charge of +2 (masses in atomic mass units, charges in erms of electron charge). Both follow curved paths. How do their radii of curvature compare? alpha particle has twice the radius of the proton alpha particle has four times the radius of the proton proton has twice the radius as the alpha particle proton has four times the radius of the alpha particle b. C. d. e. they have the same radius of curvature

Explanation / Answer

if there velocities are equal  


alpha particle has twice the radius of the proton.
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