A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2cm away from the source? Calculate a. The wavelength b. The frequency c. The wave speed
(a) Wavelength = distance between two consecutive crests or troughs is 2 cm. (b) Frequency = NumberoftroughsTime = 153 = 5 Hz (c) Wave speed = DistanceTime Distance travelled by wave = 15 x 2 = 30 cm Time = 3 seconds Wave speed = 303 = 10 cm/s
