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Q.

If the atmospheric pressure is 76cm of Hg at what depth of water in a lake the pressure will becomes 2 atmospheres nearly.

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a

932 cm

b

1033 cm

c

862 cm

d

982 cm

answer is D.

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Detailed Solution

Given:

P0=76 cm of Hg

P0=hρg=76×136×980  dynes

P=P0+hρg

2P0=P0+hρg

P0=hρg

76×13.6×980=h×1×980

h=76×13.6=1033 cm

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If the atmospheric pressure is 76cm of Hg at what depth of water in a lake the pressure will becomes 2 atmospheres nearly.