A) 13.6 cm
B) 9.8 cm
C) 10cm
D) 76cm
Correct Answer: A
Solution :
[a] Pressure difference between lungs and atmosphere \[=(760-750)mm\]of Hg \[=10mm\text{ }of\text{ }Hg=1cm\]of Hg Let the boy can suck water from depth h. Then Pressure difference \[h{{\rho }_{water}}g=1cm\,of\,Hg\] or, \[h\times 1g\,c{{m}^{-3}}\times 980cm\,{{s}^{-2}}\] \[=1cm\times 13.6g\,c{{m}^{-3}}\times 980\,cm\,{{s}^{-2}}\] \[\therefore \,\,\,h=13.6cm\] The boy can suck water from the depth of 13.6cm
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