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y=Acosω[t-(x-L)/u] y=Acosω[t-(x+L)/u] y=Acosω[t+(r+L)/u] y=Acosω[t+(x-L)/u]
y=Acosω[t-(x-L)/u] y=Acosω[t-(x+L)/u] y=Acosω[t+(x+L)/u] y=Acosω[t+(x-L)/u]
0.01cm 0.01m -0.01m 0.01mm
yP=2cos(4πt-π)m yP=2cos(4πt+π)m yP=2cos47πtm
y=0.02cos2π(2t-0.01x)(SI) y=0.02cos2π(2t-100x)(SI)
y=Acos(2πt/T+2πx/λ+1/2π) y=Acos(2πt/T+2πx/λ-1/2π) y=Acos(2πt/T-2πx/λ-1/2π) y=Acos(2πt/T-2πx/λ+1/2π)
yP=2cos(4πt-π)m yP=2cos(4πt-)m yP2cos(4πt+π)m yP2cos4πt m
yp=2cos(4πt-x)m yp=2cos(4πt-π/2)m yp=2cos(4πct+π)m yp=2cos4xπtm
y=2cos(4πt-π/2)m y=2cos(4πct+π)m y=2cos(4πt-x)m y=2cos4xπtm
0.4m·s-1 -0.4m·s-1 0.4π2m·s-1
频率γ=3Hz 波长为2m 0点的振幅为-0.1m 波速为9m/s
0.4m·s-1 -0.4m·s-1 0.47π2m·s-1
0.4m·s-1 -0.4m·s-1 0.4π2m·s-1
0.4m·s-1 -0.4m·s-1 0.47π2m·s-1
yP=2cos(4πt-π)m yP=2cos(4πt+π)m yP=2cos47πtm
0.01cm 0.01m -0.01m 0.01mm
0.01cm 0.01m -0.01m 0.01mm
O点的振幅为-0.1m 频率γ=3Hz 波长为2m 波速为9m/s