Twice per cycle, a stretched string carrying a stationary wave is:

  1. broken
  2. momentarily straight (all displacements zero)
  3. still at nodes only
  4. at maximum displacement everywhere
Answer

B) momentarily straight (all displacements zero)

Graphically, the two travelling waves cancel at that instant. SLO P-11-D-11 · Understanding

Physics MCQ · More Superposition, Stationary Waves and Beats MCQs · Practise