When an ideal diatomic gas is heated at constant pressure the fraction of the heat energy supplied which increases the internal energy of the gas is .

Options

A. `(2)/(5)`
B. `(3)/(5)`
C. `(3)/(7)`
D. `(5)/(7)`

Explanation

To solve the problem of finding the fraction of heat energy supplied that increases the internal energy of an ideal diatomic gas when heated at constant pressure, we can follow these steps:

### Step 1: Understand the Variables
- **Cp**: Heat capacity at constant pressure.
- **Cv**: Heat capacity at constant volume.
- **m**: Mass of the gas.
- **ΔT**: Change in temperature.

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