A Periodic Traveling Wave Is Generated on a String of Linear

Multiple Choice

A periodic traveling wave is generated on a string of linear density 8.0 × 10-4 kg/m. Figure A shows the displacements of the particles in the string as a function of the position x along the string at t = 0 s. Figure B shows the displacement of the particle at x = 0 m as a function of time. The particle positions are measured from the left end of the string (x = 0 m) and the wave pulses move to the right.
-What is the minimum time required for the particles to return to their respective positions at t = 0 s?

A) 0.1 s
B) 0.2 s
C) 0.3 s
D) 0.4 s
E) 0.7 s