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    can anyone expain calculation of phase difference of two different points on a stationary wave? ps. points are on two different waves of same amplitude and frequency that are superposed to form a stationary wave
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    if the path difference is an odd number of half wavelengths the phase difference is 180 degrees - or antiphase this results in destructive interference.
    if the path difference is an even number of half wavelengths (i.e. an integer number of whole wavelengths) this results in constructive interference.
    if you need a phase angle φ based on wavelength λ and path difference x it's
    360 x/λ (in degrees)
 
 
 

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