The two interfering waves have intensities in the ratio $9 : 4$. The ratio of intensities of maxima and minima in the interference pattern will be
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(b) $\frac{{{I_{\max }}}}{{{I_{\min }}}} = {\left( {\frac{{\sqrt {\frac{{{I_1}}}{{{I_2}}}} + 1}}{{\frac{{\sqrt {{I_1}} }}{{\sqrt {{I_2}} }} - 1}}} \right)^2} = {\left( {\frac{{\sqrt {\frac{9}{4}} + 1}}{{\sqrt {\frac{9}{4}} - 2}}} \right)^2} = \frac{{25}}{1}$
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