It is planned to install a compressor having operating speed of $1000$ rpm at a distance of

$50$ m from a precision machine. Suggest a suitable open trench barrier to provide effective

passive isolation. The velocity of shear waves at the site was found as $140\frac{m}{s}.$

$\frac{A_T}{{}_R^2}=2\mathrm{.}5at\frac{R}{{}_R}=2\mathrm{.}0$

$\frac{A_T}{{}_D^2}=6\mathrm{.}0at\frac{R}{{}_R}=7\mathrm{.}0$