Principles of Physics by Hafez A . Radi

Author:Hafez A . Radi
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg

(16.4)

The resultant wave y has the following important characteristics: (1)It is a sinusoidal wave and has the same frequency f and wavelength as any one of the contributing waves and

(2)It has an amplitude of

(3)It has a phase of

Now, let us consider the following three cases: (a)If then and the amplitude of y is +2 A, i.e. twice the amplitude of either one of the individual waves. In this case, the waves are said to be in phase and thus interfere constructively, see Fig. 16.1a. In general, constructive interference occurs if the phase is an even multiple of i.e. then

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