physics/ fizik =
Thursday, March 5, 2009
CRO1
9.1 Understanding the uses of the Cathode Ray Oscilloscope
Thermionic emission
1. A metal surface has many free electrons
2. When it is heated to certain temperature, some of the electrons have gained enough kinetic energy to break free and escape to surroundings.
3. This effect is known as thermionic emission.
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2. When it is heated to certain temperature, some of the electrons have gained enough kinetic energy to break free and escape to surroundings.
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