$2.$ A wave moves along a string in the $+$x direction with a speed of $8\mathrm{.}0$ m$/$s$,$ a frequency of $4\mathrm{.}0$ Hz$,$ and amplitude of $0\mathrm{.}050$ m$.$a$)$ Determine the wavelength.b$)$ Determine the wavenumber.c$)$ Determine the period.d$)$ Determine the angular frequency.e$)$ What is the equation for this traveling wave?$3.$ Wave Interference and Standing Waves