The ratio of de-Broglie wavelength of molecules of hydrogen and helium which are at temperatures $27^{\circ} \mathrm{C}$ and $127^{\circ} \mathrm{C}$ respectively is

• A

  $\begin{aligned} & 2: 3\end{aligned}$
• Correct answer
  B

  $\begin{aligned} & 2 \sqrt{2}: \sqrt{3} \end{aligned}$
• C

  $\begin{aligned} & \sqrt{3}: 2 \sqrt{2}\end{aligned}$
• D

  $\begin{aligned}& \sqrt{2}: \sqrt{3}\end{aligned}$

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