The Electron: Particle and Wave

The Electron as a Particle: Crookes and Cathode Ray Tubes The Crookes tube and various cathode ray tubes demonstrate the electron as particle.
The Electron as Wave: Atomic Emission Spectra The atomic emission spectra of hydrogen, helium, neon, and mercury are shown.

Electrons, like light, display both particle-like and wave-like properties. Crookes and cathode ray tubes are used to demonstrate the electron's particle-like nature; the spectra of atomic discharge lamps can be understood in terms of the electron's wave-like properties.

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