Stationary waves are formed when

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(B) Stationary waves (also known as standing waves) are formed by the superposition of two waves of the same frequency (or wavelength) and same amplit

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Two waves of equal wavelength and equal amplitude travel along the same path with equal speeds in opposite directions

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(B) Stationary waves (also known as standing waves) are formed by the superposition of two waves of the same frequency (or wavelength) and same amplitude traveling in opposite directions along the same path.Since $v = f \lambda$, if the frequency and wavelength are the same, the speeds are also the same.Therefore, the condition is that two waves of equal wavelength, equal amplitude, and equal speed travel along the same path in opposite directions.Thus, option $B$ is the correct answer.

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