A person standing $1\mathrm{.}25$ m from a portable speaker hears its sound at an intensity of $5\mathrm{.}10103$ W$/$m$2.$

HINT

$($a$)$

Find the corresponding decibel level.

dB

$($b$)$

Find the sound intensity $($in W$/$m$2)$ at a distance of $51\mathrm{.}0$ m$,$ assuming the sound propagates as a spherical wave.

W$/$m$2$

$($c$)$

Find the decibel level at a distance of $51\mathrm{.}0$ m$.$

dB