When potassium metal is exposed to violet light

Options

A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place

Explanation

To solve the question "When potassium metal is exposed to violet light, what will happen?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Nature of Potassium**:
- Potassium (K) is an alkali metal. Alkali metals have one valence electron in their outermost shell.

2. **Understand Ionization Energy**:
- Ionization energy is the energy required to remove an electron from an atom. For alkali metals, this energy is relatively low, which means they can easily lose their valence electron.

3. **Exposure to Violet Light**:
- When potassium metal is exposed to violet light, the light provides energy to the electrons in the potassium atoms.

4. **Energy Absorption**:
- The valence electron of potassium absorbs the energy from the violet light. If the energy absorbed is sufficient, it can cause the electron to transition to a higher energy level (excited state) or even be completely removed from the atom.

5. **Ejection of Electron**:
- If the energy from the violet light is enough to overcome the ionization energy, the electron will be ejected from the potassium atom. This process is known as the photoelectric effect.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the ejection of electrons takes place when potassium metal is exposed to violet light.

### Final Answer:
- **Ejection of electron takes place.**