If $c_V$ and $c_V$ denote the specific heats (per unit) mass of an ideal gas of molecular weight $M$, then 

where $R$ is the molar gas constant.

  • A$c_P - c_V =R/M^2$
  • B$c_P - c_V =R$
  • C$c_P - c_V =R/M$
  • D$c_P - c_V =MR$
AIPMT 2010, Easy
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