Fill in the blanks in the following sentences with appropriate words:
The minimum amount of energy required to emit an electron from a metal surface is called ________ .

Explanation

To solve the question, we need to identify the term that describes the minimum amount of energy required to emit an electron from a metal surface.

### Step-by-Step Solution:

1. **Understanding the Concept**:
- When we talk about emitting an electron from a metal surface, we are referring to a phenomenon related to the interaction between light (or other forms of energy) and electrons in a metal.

2. **Identifying the Term**:
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