A thermally isolated gaseous system can exchange energy with the surroundings. The mode of energy may be

Options

A. Heat
B. Work
C. Heat and radiation
D. Internal energy

Answer

To solve the question regarding the mode of energy exchange in a thermally isolated gaseous system, we can follow these steps:

### Step 1: Understand the Definition of a Thermally Isolated System
A thermally isolated system is one that does not exchange heat with its surroundings. This means that any changes in energy within the system cannot occur through heat transfer.

**Hint:** Remember, "thermally isolated" means no heat exchange.

### Step 2: Identify the Types of Energy Exchange
In thermodynamics, energy can be exchanged in two main ways:
1. Heat (thermal energy)
2. Work (mechanical energy)

Since the system is thermally isolated, it cannot exchange heat with the surroundings.

**Hint:** Think about the implications of being thermally isolated.

### Step 3: Determine the Mode of Energy Exchange
Given that the system cannot exchange heat, the only mode of energy exchange that remains is work. Work can be done on or by the system, resulting in changes in the internal energy of the gas.

**Hint:** Focus on what remains possible when heat exchange is not an option.

### Step 4: Conclusion
Thus, the mode of energy exchange for a thermally isolated gaseous system is through work.

**Final Answer:** The mode of energy exchange is work.