A swimmer goes from the surface of water to a depth of 20m the change in the pressure on his body is nearly

An air bubble rises to the surface of water from a depth of 2.5m . The temperature on the surface of water is 40^(0)C .If the radii of the bubble are 1.8mm and 2mm at that depth and on the surface respectively, what is temperature at the depth(nearly)

An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3)

An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive Index of water is 4/3)