1. At what distance along its length would you divide a 65cm long guitar string so that the two segments sound pitches one octave apart when plucked? A.0.325m B.0.13m C.0.217m D.0.163m 2. One guitarist is jamming in a room, producing a sound pressure level of 80dB. Some friends join them and start playing exactly the same thing. The total sound pressure level is now found to be 86dB. How many friends joined the jam? A.1 B.2 C.4 D.3