1. The problem statement, all variables and given/known data A physics professor demonstrates the Doppler effect by tying a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 100 rpm. 2. Relevant equations f =fo(1/ (V +/- Vsource/V)) 3. The attempt at a solution T = 1/(100r/min)*((1min/60s)) = 0.6seconds d = 2pi(1.0m) vsource = d/t = 2pi /0.6 = 10.4719 m/s f+ = 1.749Hz f- = 1.749Hz which is obviously wrong...because they should be hearing different frequencies when source is moving towards or away from the students. can anyone tell me what i am doing wrong?