INTERFERENCE OF WAVES
When two or more waves combine at a particular point, they are said to interfere and the phenomenon is called interference. The resultant waveform is strongly dependent on the relative phases of the interfering waves.
Figure 1.17 shows an example of occurrence of interference effects. The loudspeakers are driven from the same source. At points equidistant from the speakers (on the line AB, which represents the entire midplace) there is complete constructive interference if the speakers are driven in phase. There are also other points P where the waves arrive in phase and interfere constructively. These other points of constructive interference are located wherever the difference in distance to the speakers is a whole number ...
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