Question

In a discharge tube electric conduction does not occur due to the movement of

• A. positive ions
• B. negative ions
• C. electrons
• D. protons

Hint:

In discharge tubes, electrons are the primary carriers of electrical conduction.

Answer 1

The Correct Option is D

Step 1: Understand Conduction in Discharge Tubes.
Electrical conduction in a discharge tube is mainly due to the motion of free electrons. These electrons, accelerated by an electric field, ionize the gas, leading to further conduction.
Step 2: Evaluate the Choices.
- Although positive ions (\( \text{cations} \)) and negative ions (\( \text{anions} \)) contribute to the current, they are not the primary charge carriers in a discharge tube.
- Electrons (\(e^-\)) are the main charge carriers responsible for electrical current in discharge tubes.
- Protons are not involved in conduction in discharge tubes because they are not free to move.
Step 3: Conclusion.
Protons do not contribute to electrical conduction within discharge tubes.
Final Answer: \[ \boxed{\text{protons}} \]