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: Recall conduction in discharge tubes.
In a discharge tube, electrical conduction primarily occurs due to the movement of free electrons. These electrons are accelerated by an applied electric field and cause ionization of the gas, creating further conduction.
Step 2: Analyze the options.
- Positive ions (\( \text{cations} \)) and negative ions (\( \text{anions} \)) contribute to current but are not the main carriers of conduction in a discharge tube.
- Electrons (\(e^-\)) are the primary carriers of electrical current in discharge tubes.
- Protons do not typically participate in conduction in discharge tubes as they are not free to move.
Step 3: Conclusion.
Protons do not contribute to electrical conduction in discharge tubes.
Final Answer: \[ \boxed{\text{protons}} \]