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Those two expressions mean the same thing. If the stationary wave is created by two traveling waves traveling in opposite directions and interfering, then the period of the stationary wave is also equal to the period of the traveling waves. What you might have seen is that the amplitude of a stationary wave is double the amplitude of the traveling waves that ...


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Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The word comes from Latin vibrationem ("shaking, brandishing"). The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road. Vibration is a classical mechanics phenomenon. Atoms may be ...


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