Which of the following particles has similar mass of electron ?

Options

A. Neutron
B. Proton
C. Positron
D. Neutrino

Answer

To determine which particle has a mass similar to that of an electron, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Mass of an Electron**:
The mass of an electron is approximately \( 9.1 \times 10^{-31} \) kg.

2. **Examine Each Particle**:
- **Neutron**: The mass of a neutron is about \( 1.675 \times 10^{-27} \) kg, which is significantly larger than the mass of an electron.
- **Proton**: The mass of a proton is approximately \( 1.673 \times 10^{-27} \) kg, which is also much larger than that of an electron.
- **Positron**: A positron is the antiparticle of the electron and has the same mass as an electron, which is \( 9.1 \times 10^{-31} \) kg.
- **Neutrino**: The mass of a neutrino is extremely small, but it is still not equal to the mass of an electron. In fact, it is often considered to be negligible compared to the mass of an electron.

3. **Conclusion**:
Among the options provided, the positron is the only particle that has a mass similar to that of an electron.

### Final Answer:
The particle that has a mass similar to that of an electron is the **positron**.

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