In a Young's double$-$slit experiment that uses electrons, the angle that locates the first$-$order bright fringes is ${}_A=9\mathrm{.}0{10}^{-4}$ degrees when the magnitude of the electron momentum is $p_A=1\mathrm{.}2{10}^{-22}k{g}^{**}\frac{m}{s}.$ With the same double slit, what momentum magnitude $p_B$ is necessary so that an angle of ${}_B=18\mathrm{.}0{10}^{-4}$ degrees locates the first$-$order bright fringes?

$p_B=$