Pressure P at a depth H is given by:-
P=P° + Hdg(Since pressure increases as we go down from a surface of a fluid and P° is pressure at topmost level ,d is density and g is accln. due to gravity)
Here ,
P = 4x10^4 Pa
P°=10^4 Pa
so substituting:-
4x10^4 = 10^4 + (h)(10^3)(10)
=> we get
h= 3 metres...
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