Problem $4(6$ points$)$: An organ pipe has two successive harmonics with frequencies $1372$ Hz and $1764$ Hz$.$ Consider the speed of sound to be $344$ Hz$.$ a$)$ Is this an open$-$open or an open$-$closed pipe? $(2)$ b$)$ Determine the harmonics at which the pipe is playing. $(2)$ c$)$ How many antinodes does each harmonic have? $(1)$ d$)$ Calculate the length of the pipe. $(1)$