Two Point Source Interference Pattern. A Mathematical Analysis. 2 Point Interference Pattern. Nodal Lines. Nodes are areas of destructive interference and antinodes are the opposite (constructive) In standing waves, nodes are the particles that appear to stand still
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A Mathematical Analysis
PD = | S1A - S2A | = | 5 - 6 | = 1
PD = | S1B - S2B | = | 3 - 4 | = 1
PD = | S1C - S2C | = | 4 - 6 | = 2
PD = | P1S1 – P1S2 | = | 5–4.5 | = 0.5
PD = | P2S1– P2S2| = | 3.5–5 | = 1.5
Red: Antinodal Lines
PD = | PnS1 – PnS2 | =(n-0.5)l
using the diagram to the right.