Accepted Answer
1 whole wave is 1 crest and 1 trough.20 crests and 20 troughs is 20 whole waves.20 waves / 0.4 seconds = 50 waves per second.Frequency = 50 Hz
1 whole wave is 1 crest and 1 trough.20 crests and 20 troughs is 20 whole waves.20 waves / 0.4 seconds = 50 waves per second.Frequency = 50 Hz