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Assertion: Stationary waves are so calle...

Assertion: Stationary waves are so called because particles are at rest in stationary waves.
Reason: They are formed by the superposition of two identical waves travelling in opposite directions.

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When two waves with the same frequency, wavelength, and amplitude travelling in opposite directions will interfere they produce a standing wave. A standing wave is a wave which is not moving i.e. it is at rest. That is why they are called standing waves.
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