Question

The pressure on a swimmer $20m$ below the surface of water at sea level is

• A. $1.0atm$
• B. $2.0atm$
• C. $2.5atm$
• D. $3.0atm$

Answer 1

Answer: (D)

Pressure at depth $h$
$=p_a+\rho gh$
where $p_a$ is atmospheric pressure
$=1.01\times 10^{5}N/m^2$
$\therefore$ $p_{total}=1.01\times 10^5+10^3\times 10\times 20$
$=3.01\times 10^{5}pa$
$=3atm$