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If frequencies are $(v-1),(v+1)$, then find beats.
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The correct answer is:
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For frequencies $v_1=v-1$ and $v_2=v+1$.
$\begin{aligned}
\text { Beats } & =\text { difference of frequencies } \\
& =v_2-v_1=(v+1)-(v-1)=v+1-v+l=2
\end{aligned}$
$\begin{aligned}
\text { Beats } & =\text { difference of frequencies } \\
& =v_2-v_1=(v+1)-(v-1)=v+1-v+l=2
\end{aligned}$
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