Question
Download Solution PDFThe cold cathode discharge method is used in:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGas discharge lamp:
A gas discharge lamp is one in which some inert gas is filled in a glass tube having two electrodes sealed into each end, which on heating allows the flow of electron through it.
To obtain a continuous flow of electron, gas is first charged but as the supply is disconnected from the bulb, the gas is discharged. Such a lamp is known as an electric gas discharge lamp.
Electric gas discharge lamps are of two main types:
1. Cold cathode lamp
2. Hot cathode lamp
In the first type, no filament is used to heat the electrode for starting but in the second type, a filament is provided for heating the main electrode at the time of starting.
Cold cathode lamps: Neon lamp, neon sign tubes, sodium vapor lamp.
Hot cathode lamps: mercury vapor lamp (medium pressure), and fluorescent tube (low-pressure mercury-vapor lamp).Last updated on Jun 2, 2025
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