Question

Standing waves can be produced

• A. on a string clamped at both the ends.
• B. on a string clamped at one end and free at the other.
• C. when incident wave gets reflected from a wall.
• D. when two identical waves with a phase difference of $\pi$ are moving in the same direction.

Answer 1

Answer: (A), (B), (C)

The correct options are
A on a string clamped at both the ends.
B on a string clamped at one end and free at the other.
C when incident wave gets reflected from a wall.

Standing waves are produced by two similar waves superposing while travelling in opposite direction.

The phenomenon is the result of interference; that is, when waves are superimposed, their energies are either added together or canceled out. In the case of waves moving in the same direction, interference produces a travelling wave.