12. A standing wave on a string has f = 382Hz tuning fork is measured to * 2 points be 1= 0.66m, what is the wave speed u? A) U = 25.2m/s B) v = 252m/s O C) = 275m/s D) v = 343m/s E) v = 686m/s F) v = 1500m/s