The energy which an `e^(-)` e acquires when accelerated through a potential difference of 1 volt is called

Options

A. 1 joule
B. 1 electron volt
C. 1 erg
D. 1 watt

Answer

To solve the question regarding the energy acquired by an electron when accelerated through a potential difference of 1 volt, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The energy (E) acquired by a charge (q) when it is accelerated through a potential difference (V) is given by the formula:
\[ E = q \cdot V \]

2. **Identifying the Charge of an Electron**:
- The charge of an electron (e) is approximately:
\[ e = 1.6 \times 10^{-19} \text{ coulombs} \]

3. **Substituting the Values**:
- Given that the potential difference (V) is 1 volt, we can substitute the values into the formula:
\[ E = (1.6 \times 10^{-19} \text{ C}) \cdot (1 \text{ V}) \]

4. **Calculating the Energy**:
- Since 1 volt is equivalent to 1 joule per coulomb (1 V = 1 J/C), we can calculate the energy:
\[ E = 1.6 \times 10^{-19} \text{ J} \]

5. **Understanding Electron Volt**:
- The energy acquired by an electron when it is accelerated through a potential difference of 1 volt is defined as 1 electron volt (1 eV). Therefore, the energy calculated (1.6 × 10^-19 J) is equivalent to 1 eV.

6. **Conclusion**:
- The energy which an electron acquires when accelerated through a potential difference of 1 volt is **1 electron volt**.

### Final Answer:
The correct answer is **1 electron volt**.

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