If energised atom/molecules carry the energy by actual movement, it is called

Options

A. conduction
B. convection
C. radiation
D. none of these

Answer

To solve the question, "If energized atom/molecules carry the energy by actual movement, it is called," we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding Energy Transfer**:
- The question refers to the transfer of energy by energized atoms or molecules. When atoms or molecules gain energy, they can move.

2. **Types of Heat Transfer**:
- There are three main modes of heat transfer: conduction, convection, and radiation.
- **Conduction**: This is the transfer of heat through a material without the movement of the material itself. It occurs when heat is transferred from one atom to another through direct contact.
- **Convection**: This involves the actual movement of atoms or molecules. In convection, the warmer, less dense fluid rises while the cooler, denser fluid sinks, creating a current that transfers heat.
- **Radiation**: This is the transfer of heat in the form of electromagnetic waves. It does not require a medium for transfer.

3. **Identifying the Correct Process**:
- Since the question specifies that the energized atoms or molecules carry energy through actual movement, we need to identify which process involves this movement.
- Convection is the process where the actual movement of atoms or molecules occurs, allowing for the transfer of heat.

4. **Conclusion**:
- Therefore, the correct answer to the question is **convection**.

### Final Answer:
If energized atom/molecules carry the energy by actual movement, it is called **convection**.