span$$style$=$"color:$$rgb$(51,51,51)$;$$font$-$family:$$arial$,$helvetica$,$clean$,$sans$-$serif;$$font$-$size:$13$px;$$line$-$height:$16$px;$$background$-$color:$$rgb$(244,249,255)$;$">$Two$$loudspeakers$,$A$$and$$B$,$are$$driven$$by$$the$$same$$amplifier$$and$$emit$$sinusoidal$$waves$$in$$phase$.$The$$frequency$$of$$the$$waves$$emitted$$by$$each$$speaker$$is$172$Hz$.$You$$are$8\mathrm{.}00$