Beats are produced with the help of two sound waves of amplitudes $3$ and $5$ units. The ratio of maximum to minimum intensity in the beats is
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(d) $\frac{{{I_{\max }}}}{{{I_{\min }}}} = {\left( {\frac{{{a_1} + {a_2}}}{{{a_1} - {a_2}}}} \right)^2} = \frac{{{{(5 + 3)}^2}}}{{{{(5 - 3)}^2}}} = \frac{{16}}{1}$
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