This question is about a loudspeaker being used as a microphone. A sinusoidal sound wave $($from another source$)$ impinges on the speaker cone. The sound level directly in front of the cone is $93\mathrm{.}7$ dB SPL$.$ The frequency is $100$ Hz$.$ The speaker cone has an effective diameter of $0\mathrm{.}25$ m$,$ a mass of $60$ g$,$ and a B$1=2\mathrm{.}2$ Tm$.$ Recall that e$=$Blv and f$=$Bli. Assume that the quantities not given can be neglected; e$.$g$.$ the mechanical stiffness can be ignored. $($a$)(8$ points$)$ Determine the RMS voltage at the electrical terminals. To get full marks, include the full circuit diagram including transformers, labelled with the correct values and units. $($b$)(2$ points$)$ Determine the peak$-$to$-$peak travel of the voice coil.