In a graph showing two waves travelling in opposite directions, at the instant they are exactly in phase the resultant:

  1. is zero everywhere
  2. has the same amplitude as one wave
  3. is a straight line
  4. has twice the amplitude of each wave at the antinodes
Answer

D) has twice the amplitude of each wave at the antinodes

Maximum displacement instant. SLO P-11-D-11 · Understanding

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