How does the liquid pressure on a diver change if :
(i) the diver moves to the greater depth, and
(ii) the diver moves horizontally ?

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Solution

(i) As the diver moves to a greater depth, pressure exerted by sea water on him also increases.
(ii) When the diver moves horizontally, his depth from the free surface remains constant and hence the pressure on him remains unchanged.

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The sound of an explosion on the surface of a lake is heard by a boatman 100 m away and by a diver 100 m below the point of explosion.

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(ii) Give a reason for your answer in part (i).

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