A monoatomic ideal gas undergoes a process in which the ratio of `P` to `V` at any istant is constant and equal to unity. The molar heat capacity of the gas is

Options

A. `(5R)/(2)`
B. `(3R)/(2)`
C. `(4R)/(2)`
D. Zero

Explanation

To solve the problem of determining the molar heat capacity of a monoatomic ideal gas undergoing a process where the ratio of pressure (P) to volume (V) is constant and equal to unity, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**:
The problem states that the ratio \( \frac{P}{V} \) is constant and equal to 1. This implies that \( P = V \).

2. **Using the First Law of Thermodynamics**:
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