If the ratio of amplitude of wave is $2 : 1$, then the ratio of maximum and minimum intensity is
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(a) $\frac{{{I_{\max }}}}{{{I_{\min }}}} = {\left( {\frac{{\frac{{{a_1}}}{{{a_2}}} + 1}}{{\frac{{{a_1}}}{{{a_2}}} - 1}}} \right)^2} = {\left( {\frac{{2 + 1}}{{2 - 1}}} \right)^2} = 9/1$
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