波动式的其它形式: y=Ac0S2πvt年S)+0 (0=2元Y) =4cos2m克+w- ,λ=uT) T =Acos[k(ut干x)+p] (k= 2元 ,u= =Acos[ot干kxr+p] 2元 2 (ku= 元 T y=Acos[@(t干)+p] 2/ 波动式的其它形式: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ = 2cos π )( +ϕν u x tAy m ω = 2( π ν ) ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ = + ϕ λ 2cos π )( x T t A m = [ m xutkA )(cos + ϕ ] = cos [ω m kxtA + ϕ ] ), 1 ( uT T λν == ), 2 π ( T uk λ λ == ) 2 π 2 π ( T uku == λ = +ϕω ])(cos[ u x tAy m