During an adiabatic reversibly expansion of an ideal gas

Options

A. Internal energy of the system decreases.
B. Temperature of the system decreases.
C. The value of `gamma` changes
D. Pressure increases.

Explanation

To solve the question regarding the adiabatic reversible expansion of an ideal gas, we will analyze the properties and behaviors of the gas during the process.

### Step-by-Step Solution:

1. **Understanding Adiabatic Process**:
- An adiabatic process is one in which no heat is exchanged with the surroundings. This means that any change in internal energy of the system is due to work done on or by the system.

2. **Graphical Representation**:
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