A cathode ray strikes a detector in a straight line, but when a magnetic or electric field is applied, the path of the ray is deflected. Accurate interpretations of this observation include: I. Cathode ray particles are charged. II. Cathode rays have both wave- and particle-like properties. III. Cathode rays are composed of electrons.

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A cathode ray strikes a detector in a straight line, but when a magnetic or electric field is applied, the path of the ray is deflected. Accurate interpretations of this observation include: I. Cathode ray particles are charged. II. Cathode rays have both wave- and particle-like properties. III. Cathode rays are composed of electrons.