The root mean square speed of oxygen molecules at a certain absolute temperature is $v$. If the temperature is doubled and the oxygen gas dissociates into atomic oxygen, the root mean square speed would be -

• A

  $v$
• B

  $\sqrt{2}v$
• Correct answer
  C

  $2v$
• D

  $2\sqrt{2}v$

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