In case of beta positive `(beta^+)` decay, a position is emitted along with

Options

A. an electron
B. a neutrino
C. an antineutrino
D. a positron

Answer

In beta positive decay (β+ decay), a positron is emitted along with a neutrino. Let's break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Beta Positive Decay**:
- Beta positive decay occurs when a proton in a nucleus is transformed into a neutron, emitting a positron and a neutrino in the process.

2. **Changes in Atomic Structure**:
- When an element undergoes beta positive decay, its atomic number decreases by 1 (since a proton is converted into a neutron), but its mass number remains unchanged.
- This can be represented as:
\[ \text{X}^{A}_{Z} \rightarrow \text{Y}^{A}_{Z-1} + \beta^{+} + \nu \]
- Here, X is the original element, Y is the new element formed, \( A \) is the mass number, \( Z \) is the atomic number, \( \beta^{+} \) is the emitted positron, and \( \nu \) is the emitted neutrino.

3. **Identifying Emissions**:
- In the decay process, two key particles are emitted:
- A **positron** (\( \beta^{+} \)): This is the antimatter counterpart of an electron.
- A **neutrino** (\( \nu \)): This is a nearly massless and chargeless particle that carries away some energy and momentum.

4. **Example of Beta Positive Decay**:
- Consider the decay of potassium-40 (\( \text{K}^{40}_{19} \)):
\[ \text{K}^{40}_{19} \rightarrow \text{Ar}^{40}_{18} + \beta^{+} + \nu \]
- In this example, potassium-40 decays to argon-40, emitting a positron and a neutrino.

5. **Conclusion**:
- Therefore, in beta positive decay, a positron is emitted along with a neutrino.

### Final Answer:
In case of beta positive decay, a positron is emitted along with a neutrino.