Question:
The process of electron emission that takes place in a spark plug is
The process of electron emission that takes place in a spark plug is
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Remember the four common types of electron emission:
\[
\boxed{
\begin{aligned}
\text{Heat} &\rightarrow \text{Thermionic},
\text{Light} &\rightarrow \text{Photoelectric},
\text{Electric field} &\rightarrow \text{Field},
\text{Particle bombardment} &\rightarrow \text{Secondary}.
\end{aligned}
}
\]
Updated On: Jul 18, 2026
- Field emission
- Photoelectric emission
- Thermionic emission
- Secondary emission
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Recall the types of electron emission.& nbsp;
Electrons can be emitted from a metal surface by different methods:
- Thermionic emission: Heating the metal.
- Photoelectric emission: Incident light.
- Field emission: Strong electric field.
- Secondary emission: Bombardment by energetic particles.
Step 2: Identify the process in a spark plug.
A spark plug operates under a very high electric field, which pulls electrons out of the electrode.
Hence, the emission involved is
\[ \boxed{\text{Field emission}.} \]
Therefore, the correct option is \[ \boxed{(A)}. \]
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