396 Interference of Light Waves*P37.46Along the line of length djoining the source, two identical wavesmoving in opposite directions add to give a standing wave. Anantinode is halfway between the sources. If d22>λ, there is space fortwo more antinodes for a total of three. If d2>, there will be at leastfive antinodes, and so on. To repeat, if d>0 , the number of antinodesis 1 or more. If d>1, the number of antinodes is 3 or more. If d>2, thenumber of antinodes is 5 or more. In general,sNANs4FIG. P37.46The number of antinodes is 1 plus 2 times the greatest integer less than or equal to d.If d24<, there will be no nodes. If d>, there will be space for at least two nodes, as shown in thepicture. If d234>, there will be at least four nodes. If d254>six or more nodes will fit in, and so on.To repeat, if 2d<the number of nodes is 0. If 2d>the number of nodes is 2 or more. If 23d>the number of nodes is 4 or more. If 25d>the number of nodes is 6 or more. Again, if d+FHGIKJ>121,the number of nodes is at least 2. If
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .