During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of  $\frac{{{C_P}}}{{{C_V}}}$  for the gas is
  • A$2$
  • B$1.67$
  • C$1.5$
  • D$1.33$
AIPMT 2013,AIEEE 2003, Medium
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