Question

By sucking through a straw, a boy can reduce the pressure in his lungs to 750 mm of Hg
density = 136 gcm) Using a straw, he can drink water from a maximum depth of
(1) 13.8 cm
@ 136 cm
() 0.136 cm
19 10 am
be then​

Answer 1

Given Pressure in lungsP

lungs

=750 mm of Hg

and atmospheric pressureP

atm

=760 mm of Hg

Now pressure difference ΔP=760−750=10 mm of Hg=1 cm of Hg

Now

1 cm of Hg=ρ

water

gh

1ρ

Hg

g=ρ

water

gh

13.6g=gh

h=13.6cm

Answer 2

Answer:

Ans. 13.6 cm

Explanation:

Pressure difference between lungs of student and atmosphere=760 - 750 = 10 mm of Hg

hdg = 10 mm of Hg = 1 cm of Hg

This pressure can only be used to drink water.

1 cm of Hg = pressure difference due to water column

=> 1 x 13.6 x g = h x 1 x g. [d of Hg=13.6 g/cm3]

=> 1 x 13.6 = h x 1

=> h = 13.6 cm

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