`C_6^14` is formed from `N_7^14`in the upper atmosphere by the action of the fundamental particle

Options

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

Answer

To solve the question regarding the formation of Carbon-14 from Nitrogen-14 in the upper atmosphere, we will analyze the nuclear reaction involved step by step.

### Step-by-Step Solution:

1. **Identify the Reactants and Products:**
- The reactant is Nitrogen-14, represented as \( ^{14}_{7}N \).
- The product is Carbon-14, represented as \( ^{14}_{6}C \).
- A fundamental particle, which we will identify, is involved in this reaction.

2. **Understand the Composition of the Nuclei:**
- Nitrogen-14 has a mass number of 14 and an atomic number of 7. This means it has 7 protons and \( 14 - 7 = 7 \) neutrons.
- Carbon-14 has a mass number of 14 and an atomic number of 6. This means it has 6 protons and \( 14 - 6 = 8 \) neutrons.

3. **Determine the Fundamental Particle Involved:**
- The reaction involves a neutron, which is represented as \( ^{1}_{0}n \) (mass number 1, atomic number 0).
- When a neutron collides with Nitrogen-14, it causes a transformation.

4. **Write the Nuclear Reaction:**
- The reaction can be written as:
\[ ^{14}_{7}N + ^{1}_{0}n \rightarrow ^{14}_{6}C + ^{1}_{1}H \]
- Here, \( ^{1}_{1}H \) represents a hydrogen atom (or a proton).

5. **Check Conservation of Mass and Atomic Numbers:**
- On the left side:
- Mass number: \( 14 + 1 = 15 \)
- Atomic number: \( 7 + 0 = 7 \)
- On the right side:
- Mass number: \( 14 + 1 = 15 \)
- Atomic number: \( 6 + 1 = 7 \)
- Both mass and atomic numbers are balanced, confirming the reaction is valid.

6. **Conclusion:**
- The fundamental particle that acts on Nitrogen-14 to form Carbon-14 is a neutron.

### Final Answer:
The fundamental particle is a **neutron**.