The wave \({{\phi }_{1}}\) and \({{\phi }_{2}}\) are orthogonal if

1
\({{\int{\left| {{\phi }_{1}} \right|}}^{2}}d\tau =0\)
2
\(\int{\phi _{2}^{*}}{{\phi }_{1}}d\tau =0\)
3
\(\int{\phi _{2}^{*}}{{\phi }_{1}}d\tau =1\)
4
\({{\int{\left| {{\phi }_{2}} \right|}}^{2}}d\tau =0\)

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