Cathode Ray Tube(to learn about an Atom)

Cathode Ray Tube(to learn about an Atom)

1. Experiment Set up

   • Electric currents passed through evacuated tubes
   • electricity passed from cathode(-) to anode(+)
   • glass coated with fluoresent material to make beams visible

2. Conclusion from experiment

   • Experiment told us
     • atoms have negatively charged particles
     • particles go around the central core
     • most of an atom is empty space

3. Observation

   • Magnetic deflection
     • Magnet deflects cathode vary in direction expected for negative particle
     • quantify the deflection
     • Cathode ray made electrons