The electron Flashcards
The electron
An indivisible unit of negative charge, of extremely small mass orbiting the nuclei of atoms
Properties of the electron
Orbits the nucleus
Very small mass
Negatively charged
Charge on electron is smallest amount of charge found in nature
Thermionic Emission
is the giving off of electrons from the surface of a hot metal surface.
The cathode ray tube
Uses
Properties of cathode rays
Cathode rays
Streams of high speed electrons
The electron volt (eV)
Energy associated with the electron
The electron volt formula
Electrons in a magnetic
Experience centripetal force therefore mv^2/r
The photo electric effect
Demonstration of the photoelectric effect
Charge a gold leaf electroscope negatively
Shine ultraviolet light in the zinc plate
Result; the leaves fall together
Observation; Shining UV light on the zinc plate liberates electrons from the zinc and therefore the legs become neutralised and fall back together.
