• # question_answer The intensity level of a sound wave is defined by an arbitrary scale. The zero of the scale is taken at the sound wave intensity A)  $1\times {{10}^{-10}}W{{m}^{-2}}$ B)  $1\times {{10}^{-12}}W{{m}^{-2}}$ C)  $1\times {{10}^{-14}}W{{m}^{-2}}$ D)  $1\times {{10}^{-16}}W{{m}^{-2}}$

The minimum intensity that can be heard, called threshold of hearing $({{I}_{0}})={{10}^{-12}}W{{m}^{-2}}$ at$1\text{ }kHz$.