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Question

By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg (density = 13.6g/cm3). Using the straw, he can drink water from a glass upto a maximum depth of


  1. 10 cm

  2. 13.6 cm

  3. 1.36 cm

  4. 75 cm


Solution

The correct option is B

13.6 cm


Pressure difference between lungs of student and atmosphere = 760 – 750 

= 10 mm of Hg

Δp=ρgh = 10 mm of Hg

h = 13.6cm

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