Stationary waves are formed when

Stationary waves are formed when
  1. two waves of equal amplitude and equal frequency travel along the same path in opposite directions
  2. two waves of equal wavelength and equal amplitude travel along the same path with equal speeds in opposite directions
  3. two waves of equal wavelength and equal phase travel along the same path with equal speed
  4. two waves of equal amplitude and equal speed travel along the same path in opposite directions

Solution

When two waves of same frequency and amplitude moving along the same path but in opposite directions superimpose, we get stationary waves.

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