Diffraction is:

  1. the bending of waves when they change speed
  2. the change of frequency of waves
  3. the spreading of waves as they pass through a gap or around an obstacle
  4. the bouncing back of waves
Answer

C) the spreading of waves as they pass through a gap or around an obstacle

Not to be confused with refraction. SLO P-11-D-13 · Understanding

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