1. Concept:A 'fixed position' piston creates an Isochoric (constant volume) process. Furthermore, an 'ideal gas' has no intermolecular forces, meaning it possesses zero potential energy.
2. Formula:$$Q = \Delta U \quad \text{(where } U = K.E_{\text{translational}} \text{)}$$
3. Solution:- Because the volume is fixed, work done is zero (\(W = 0\)). Thus, First Law states \(Q = \Delta U\).
- All supplied heat goes directly into increasing the internal energy.
- By the kinetic theory of gases, the internal energy of a purely ideal gas consists exclusively of the translational kinetic energy of its molecules.
4. Why other options are incorrect:An ideal gas is theoretically defined as having absolutely no intermolecular forces, therefore zero potential energy. Heating a gas cannot create new molecules.
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