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CSS Physics QUESTION #1165
Question 1
At constant pressure and volume, the exact relation between \(C_p\) and \(C_v\) is:
  • C_p > C_v
  • \(C_p / C_v > 1\)
  • \(C_p - C_v = R\)
  • All of these✔️
Correct Answer Explanation
All three relations are simultaneously true for an ideal gas: (A) \(C_p > C_v\) because at constant pressure extra heat is needed to do work against expansion. (B) \(C_p/C_v = \gamma > 1\). (C) The Mayer relation: \(C_p - C_v = R\) (per mole). So all of these are correct.