A submarine experiences a pressure of 5.05 × 10⁶
Pa at a depth of d₁ in a sea. When it goes further to a depth
of d₂, it experiences a pressure of 8.08 × 10⁶
Pa. Then d₂ –d₁ is approximately (density of water = 10³
kg/m³
and acceleration due to gravity = 10 ms^–2
) :