WAVES AND SOUND: v = fx D = f= cycles SIPOIR f seconds T = fapparent = factual (Vround - "source) Vsound = 331 m/s + (0.6 m/s X Temperature ) A swimmer resting on a raft notices 12 wave crests pass him in 18 s. The distance between one crest and the next crest is 2.6 m. Find: (a) frequency (b) velocity of the waves? c) period? d) If the temperature of the air where the swimmer rest is 23 degrees Celsius, what is the speed of sound