Question

describe how electrons can be liberated from a cold cathode and a hot cathode

Answer 1

Cold-cathode discharge lamps use higher voltages than hot-cathode ones. The resulting strong electric field near the cathode accelerates ions to a sufficient velocity to create free electrons from the cathode material. Another mechanism to generate free electrons from a cold metallic surface is field electron emission.

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Answer 2

Answer:

Electrons can be liberated from a cold cathode and a hot cathode.

Explanation:

Hot cathodes often emit much more electrons from the same surface area than cold cathodes due to their increased power density. Cold cathodes don't need to be heated because they rely on secondary electron emission from positive ion bombardment or field electron emission.

Thermionic emission occurs when the cathode is heated to a point where electrons are "boiled off" of its surface and into the tube's evacuated space.

Higher voltages are used by cold-cathode discharge lamps than by hot-cathode ones. Ions are accelerated to a high enough speed by the resulting strong electric field close to the cathode to liberate free electrons from the cathode material.

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