The given diagram shows a detector placed between a transmitter o… - Vidyadip

MCQ

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$ )

A
$900$
✓
$100$
C
$0.01$
D
$0.09$

✓

Answer

Correct option: B.

$100$

b
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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