In photoelectric effect, emitted electrons are

Options

A. those which are moving in a shell near to the nucleus
B. those which are present in the nucleus
C. those which are moving freely in the inter atomic distance
D. those which are produced from neutron disintegration

Answer

To solve the question regarding the photoelectric effect and the nature of emitted electrons, we will analyze the options provided and determine which one correctly describes the emitted electrons.

### Step-by-Step Solution:

1. **Understanding the Photoelectric Effect**:
The photoelectric effect occurs when light (photons) strikes a material and causes the emission of electrons. The key factor here is that the energy of the incoming photons must be sufficient to overcome the work function of the material, allowing electrons to escape.

**Hint**: Remember that only certain electrons can be emitted based on their energy levels and proximity to the nucleus.

2. **Identifying Electron Locations**:
Electrons in an atom are located in various shells (K, L, M, N, etc.). The electrons closest to the nucleus (in the inner shells) are held tightly due to the strong electrostatic forces between them and the positively charged nucleus.

**Hint**: Electrons in inner shells are less likely to be emitted because they are more tightly bound to the nucleus.

3. **Evaluating the Options**:
- **Option 1**: Electrons moving in a shell near the nucleus.
- **Analysis**: These electrons are tightly bound and require much more energy to be emitted than what photons can provide. Thus, this option is incorrect.

- **Option 2**: Electrons present in the nucleus.
- **Analysis**: Electrons do not exist in the nucleus in a way that allows them to be emitted via the photoelectric effect. This option is also incorrect.

- **Option 3**: Electrons moving freely in inter-atomic distance.
- **Analysis**: This option is correct. The electrons that are in the outermost shell (valence electrons) can be easily ejected when photons strike the material, as they are less tightly bound.

- **Option 4**: Electrons produced from neutron disintegration.
- **Analysis**: While neutrons can decay into protons and electrons, this process does not relate to the photoelectric effect. Electrons produced in this manner cannot be emitted by the action of photons. Thus, this option is incorrect.

4. **Conclusion**:
The correct answer is **Option 3**: Electrons moving freely in inter-atomic distance (outermost shell) are ejected during the photoelectric effect.

### Summary of the Solution:
- The photoelectric effect involves the emission of electrons when photons strike a material.
- Electrons in the outermost shell are the ones that can be emitted, while those closer to the nucleus are not easily ejected.
- The correct option is that electrons moving freely in inter-atomic distance are emitted.