When a neutron is disintegrated, it has :-

Options

A. one proton, one electron and one anti neutrino
B. one proton, one electron and one neutrino
C. one proton, one position and one neutrino
D. one proton, `lambda`-rays and one neutrino

Explanation

To solve the question "When a neutron is disintegrated, it has:", we need to analyze the process of neutron decay, also known as beta decay. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Composition of a Neutron
A neutron is a neutral particle found in the nucleus of an atom. It is made up of three quarks (one up quark and two down quarks).

**Hint:** Remember that neutrons are neutral and are part of the atomic nucleus along with protons.

### Step 2: Identify the Decay Process
When a neutron decays, it transforms into a proton, an electron, and an antineutrino. This process is known as beta decay.

**Hint:** In beta decay, a neutron is converted into a proton, which is a key point to remember.

### Step 3: Write the Decay Equation
The decay can be represented by the following equation:
\[ n \rightarrow p + e^- + \bar{\nu} \]
Where:
- \( n \) = neutron
- \( p \) = proton
- \( e^- \) = electron (beta particle)
- \( \bar{\nu} \) = antineutrino

**Hint:** Make sure to note the particles produced in the decay process.

### Step 4: Analyze the Conservation Laws
In this decay process, the following conservation laws apply:
- **Conservation of Charge:** The neutron is neutral, and the products (proton and electron) also sum to neutral when considering the antineutrino.
- **Conservation of Baryon Number:** The baryon number remains the same; the neutron (baryon number = 1) is converted into a proton (baryon number = 1) and does not change the total count of baryons.
- **Conservation of Lepton Number:** The electron carries a lepton number of +1, and the antineutrino carries a lepton number of -1, balancing the lepton number to zero.

**Hint:** Conservation laws are crucial in particle physics; they help ensure that the decay process is valid.

### Step 5: Identify the Final Products
From the decay process, we conclude that when a neutron disintegrates, it produces:
- 1 proton
- 1 electron
- 1 antineutrino

**Hint:** List out the products clearly to avoid confusion.

### Conclusion
Thus, when a neutron is disintegrated, it has one proton, one electron, and one antineutrino. Therefore, the correct answer is option number one.

**Final Answer:** 1 proton, 1 electron, and 1 antineutrino.