The formula used to find the pressure on a swimmer h metres below the surface of a lake is: (where P_a is the atmospheric pressure.)

hpg

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P_a + hpg

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P_a + hp

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P_a – hpg

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Solution

The correct option is B
P_a + hpg

The atmospheric pressure also needs to be added to find the total pressure on the swimmer.

P = P_a + hpg

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