Bats can detect small objects such as insects that are of a size on the order of a wavelength. If bats emit a chirp at a frequency of $60.$ kHz and the speed of soundwaves in air is $343$ m$/$s$,$ what is the smallest size insect they can detect? a$.1\mathrm{.}5$ mm b$.3\mathrm{.}5$ mm c$.5\mathrm{.}7$ mm d$.7\mathrm{.}5$ mm e$.9\mathrm{.}8$ mm