§122。ne- dimensional waves and the equation of waves 3. Periodic waves (a)Space period Y(, t A snapshot at some instant to (b) Time period (x,D) An oscillation at any given position o I 812.2 one-dimensional waves and the equation of waves n one time period, some oscillatory state propagate one space period. T Phase speed:v=y=元v T 66 3. Periodic waves x ( , ) 0 Ψ x t λ o λ (a) Space period A snapshot at some instant t0 o t ( , ) 0 Ψ x t T T (b) Time period An oscillation at any given position x0 §12.2 one-dimensional waves and the equation of waves In one time period, some oscillatory state propagate one space period. Phase speed: λ ν λ = = ⋅ T v λ T §12.2 one-dimensional waves and the equation of waves