The given diagram shows a detector placed between a transmitter of sound waves and a metal plate. At three adjacent points, $ R, S$ and $T$ , the meter shows zero intensity. Which of the following is the frequency of the emitted wave ... $Hz$ ? (Take the velocity of sound as $ = 300\ m/s$ )
Diffcult
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As point $R, S$ and $T$ have zero intensity
$\Rightarrow$ Destructive interference will occur at these points.
$\frac{\lambda}{2}=1.5$
$\lambda=3 \mathrm{\,m}$
$\mathrm{v}=\lambda \mathrm{f}$
$\mathrm{f}=100 \mathrm{\,Hz}$
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