JAMB - Physics (2008 - No. 19)
Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length
12.4 m
15.7 m
17.5 m
18.6 m
คำอธิบาย
Comparing y = 5sin (200 πt - 0.4X) with the wave equation y = A sin (wt -KX) K = (2π)/λ = 0.4
∴ λ = (2π)/0.4 = 15.7M
∴ λ = (2π)/0.4 = 15.7M