MCQ
In a stationary wave, all particles are
- ✓At rest at the same time twice in every period of oscillation
- BAt rest at the same time only once in every period of oscillation
- CNever at rest at the same time
- DNever at rest at all
Hence, Option $A$ is correct.
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$\begin{array}{|c|c|c|c|}\hline \mathrm{C_{1 }} & {\mathrm{C}_{2}} & {\mathrm{C}_{3}} & {\mathrm{T}} \\ \hline {1 l} & {2 l} & {-} & {60^{\circ} \mathrm{C}} \\ \hline {-} & {1 l} & {2 l} & {30^{\circ} \mathrm{C}} \\ \hline {2 l} & {-} & {1 l} & {60^{\circ} \mathrm{C}} \\ \hline {1 l} & {1 l} & {1 l} & {\theta} \\ \hline\end{array}$
The value of $\theta$ (in $^{\circ} \mathrm{C}$ to the nearest integer) is
