The elastic constant and density of sea water are respectively $2.156 imes 10^{9} \mathrm{Nm}^{-2}

Question

The elastic constant and density of sea water are respectively $2.156 	imes 10^{9} \mathrm{Nm}^{-2}$ and $1.1 	imes 10^{3} \mathrm{~kg} / \mathrm{m}^{3}$. In a sonar experiment it was found that the accoustic echo from the sea bed is heard after 2 s . Then the depth of the sea is\

Professor PC Thomas Classes · Answer

$\mathrm{d}=\frac{\mathrm{vt}}{2}$\ $\mathrm{t}=2 \mathrm{~s}$\ $v=\sqrt{\frac{\mathrm{k}}{ho}}$\ $k=2.150 	imes 10^{9} \mathrm{Nm}^{-2}$\ $ho=1.1 	imes 10^{3} \mathrm{~kg} / \mathrm{m}^{3}$\