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In an interference arrangement, similar to Young’s double slit experiment, the slits S₁ and S₂ are illuminated with coherent microwave sources, each of frequency 106 Hz. The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150.0 m. The intensity${\mathrm{I}}_{\left(\mathrm{\theta }\right)}$ is measured as a function of $\mathrm{\theta }$, where $\mathrm{\theta }$ is defined as shown in the figure. If I₀ is maximum intensity, then ${\mathrm{I}}_{\left(\mathrm{\theta }\right)}$ for
 $0\le \mathrm{\theta }\le$90 is given by

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