By sucking through a straw, a student can reduce the pressure in his lungs to $750\, mm\, of\, Hg$ (density $= 13.6\, gm/cm^3$). Using the straw, he can drink water from a glass upto a maximum depth of ....... $cm$
A$10$
B$75$
C$13.6$
D$1.36$
AIIMS 2006, Medium
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C$13.6$
c Pressure difference created $=10\,mm$ of $Hg$
This must be equal to the pressure of water column being created in the straw. If height of water column be $h$
$h\rho g = \frac{{10}}{{10}} \times 13.6 \times g$
$h \times 1 = 13.6 \Rightarrow h = 13.6\,cm.$
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