difrence between path lenght
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The wave from Source 2 (S2) travels a distance of 7 wavelengths to reach the same point. The difference in distance traveled by the two waves is one full wavelength. ... When the path difference is two full wavelengths, a crest meets a crest and constructive interference occurs.
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well path length is the entire length or path traced by a body also called distance and displacement is the shortest distance from final to initial or vice versa
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