An experiment requires a gas with $\gamma=1.50$. This can be achieved by mixing together monatomic and rigid diatomic ideal gases. The ratio of moles of the monatomic to diatomic gas in the mixture is

• A

  $1: 3$
• B

  $2: 3$
• Correct answer
  C

  $1: 1$
• D

  $3: 4$

Hence, the correct answer is option: 'C'.