1. Two identical strings on different cellos are tuned to the 440-Hz A note. The peg holding one of the strings slips, so its tension is decreased by 1.5%. What is the beat frequency heard when the strings are played together? f₁=440Hz; Tension decrease=1.5% 2. f(beat)=|f₁-f₂| 3. f₂=440Hz - (440Hz*.015)=433.4Hz f(beat)=|440Hz-433.4Hz|=6.6Hz The answer is supposed to be 3.3Hz. I would really appreciate the help. Thanks.