Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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Electric Conduction Takes Place in a Discharge Tube Due to the Movement of (A) Positive Ions (B) Negative Ions (C) Electrons (D) Protons - Physics

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ConceptConcept of Semiconductor Electronics: Materials, Devices and Simple Circuits

Question

Electric conduction takes place in a discharge tube due to the movement of _____________ .
(a) positive ions
(b) negative ions
(c) electrons
(d) protons

Solution

(a) positive ions
(b) negative ions
(c) electrons

Some ions are always present in gases due to cosmic rays and other factors. When we apply potential difference  across a discharge tube, the ions get accelerated due to the electric field. If the potential difference is large, then the ions get enough energy to ionise the molecules on collision.
Thus, a large number of ions are produced and conduction starts. Generally, an electron gets detached from a molecule to make the molecule a positive ion. At low pressure, this electron moves through a large distance and gets attached to another molecule and forms a negative ion.
Thus, electric conduction takes place in a discharge tube due to the movement of positive ions, negative ions and electrons.

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Solution Electric Conduction Takes Place in a Discharge Tube Due to the Movement of (A) Positive Ions (B) Negative Ions (C) Electrons (D) Protons Concept: Concept of Semiconductor Electronics: Materials, Devices and Simple Circuits.
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