An open glass tube is immersed in mercury in such a way that a length of $8 \mathrm{cm}$ extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional $46 \mathrm{cm}$. What will be length of the air column above mercury in the tube now ?
(Atmospheric pressure = $76 \mathrm{cm}$ of Hg)

• Correct answer
  A

  $16 \mathrm{cm}$
• B

  $22 \mathrm{cm}$
• C

  $38 \mathrm{cm}$
• D

  $6 \mathrm{cm}$

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