Under which condition can stationary waves form?

On a string fixed at both ends.
On a string fixed at one end and loose at the other.
When a wave reflects back from a rigid surface.
When two waves with the same frequency and a phase difference of π travel in the same direction.

Correct answer: On a string fixed at both ends.

Solution

Stationary waves form when two waves of the same frequency and amplitude travel in opposite directions and interfere. This condition is naturally satisfied on a string fixed at both ends.

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