Define stationary waves or standing waves.
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◆Standing wave, also called stationary wave, combination of two waves moving in opposite directions and making the angle of 180°, each having the same amplitude and frequency.
> The phenomenon is the result of interference—that is, when waves are superimposed, their energies are either added together or cancelled out.
> The phenomenon is the result of interference—that is, when waves are superimposed, their energies are either added together or cancelled out.
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When two sets of progressive wave trains of the same type (i.e. both longitudinal or both transverse) having the same amplitude and same time period/frequency/ wavelength travelling with same speed along the same straight line in opposite directions superimpose, a new set of waves are formed. These are called stationary waves or standing waves.
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