Physics · Diode Valve
Why is the tungsten filament/cathode in a thermionic diode valve typically coated with barium oxide?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To increase the electrical resistance of the cathode
- 2To lower the work function and increase electron emission✓
- 3To prevent oxidation of tungsten
- 4To increase mechanical strength
Correct answer
To lower the work function and increase electron emission
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