(2013)一横波沿一根弦线传播,其方程为y=-0.02cosπ(4x-50t)(SI),该波的振幅与波长分别为:()
A:0.02cm,0.5cm
B:-0.02m,-0.5m
C:-0.02m,0.5m
D:0.02m,0.5m
出自:基础考试