試題詳解

6. Two sine waves with opposite phases but the same amplitude of A=0.1 m and frequency f=5 Hz are traveling in opposite directions along a string, forming a standing wave. The mass per unit length of the string is μ=0.02 kg/m. Determine the kinetic energy per unit length of the string at the moment when the two waves completely overlap, causing the string to appear as a straight line.
(A) 0.194J/m
(B) 0.264J/m
(C) 0.395J/m
(D) 0.413J/m
(E) 0.528J/m