67. Two coherent sources send transverse waves in the same phase. The oscillation periods T = 0.2, the propagation velocity of waves in the medium υ = 800 m / s. Determine if a path difference in the case of superposition of waves will occur: 1) the weakening of the oscillation; 2) amplification of the oscillations.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)