Figure, shows a stationary wave between two fixed points $P$ and $Q$. Which point$(s)$ of $1, 2$ and $3$ are in phase with the point $X?$
Figure, shows a stationary wave between two fixed points $P$ and $Q$. Which point$(s)$ of $1, 2$ and $3$ are in phase with the point $X?$
- A
$1, 2$ and $3$
- B
$1$ and $2$ only
- C
$2$ and $3$ only
- D
$3$ only
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