Electronic

Physics

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Thermionic emission

The release of electrons from the heated metal surface

As the temperature of the cathode increases......

...... the rate of thermionic emission increases

As the surface area of the cathode increases.....

.....the rate of thermionic emission increases

As the potential difference between the anode and the cathode increases....

.....the electron velocity increases, causing the electron beam to accelerate

Characteristics of cathode rays

Move-in a straight line at high velocity, Has momentum and kinetic energy, Produces X-rays when exposed to heavy metals

1. Charged –ve. 2. Can be deflected by the magnetic field.

Characteristics of cathode rays

Electron is emitted from.....

.....cathode

Factors that affects thermionic emission

Temperature and surface area of cathode

The type of cathode and cathode plating

are factor that influences thermionic emission

Characteristics of cathode rays

Move in a straight line at high velocity

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