10.4 COHERENT AND INCOHERENT ADDITION OF WAVES
Chapter 2: Chapter 10 · PHYSICS PART-2 · EN medium
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In this section we will discuss the interference pattern produced by the superposition of two waves. You may recall that we had discussed the superposition principle in Chapter of your Class XI textbook. Indeed the entire field of interference is based on the superposition principle according to which at a particular point in the medium, the resultant displacement produced by a number of waves is the vector sum of the displacements produced by each of the waves. Consider two needles S1 and S2 moving periodically up and down in an identical fashion in a trough of water [Fig. . (a)].
📖 NCERT Class 12 Physics Part 2 · Page 56
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In this section we will discuss the interference pattern produced by the superposition of two waves. You may recall that we had discussed the superposition principle in Chapter of your Class XI textbook. Indeed the entire field of interference is based on the superposition principle according to which at a particular point in the medium, the resultant displacement produced by a number of waves is the vector sum of the displacements produced by each of the waves. Consider two needles S1 and S2 moving periodically up and down in an identical fashion in a trough of water [Fig.
. (a)]. They produce two water waves, and at a particular point, the phase difference between the displacements produced by each of the waves does not change with time; when this happens the two sources are said to be coherent. Figure .
(b) shows the position of crests (solid circles) and troughs (dashed circles) at a given instant of time. Consider a point P for which
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