A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point $A$ is moving upwards. Which of the following statements is/are correct
Medium
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(d) Since $A$ is moving upwards, therefore, after an elemental time interval the wave will be as shown dotted in following fig. It means, the wave is travelling leftward. Therefore, $(a)$ is wrong.
Displacement amplitude of the wave means maximum possible displacement of medium particles due to propagation of the wave, which is equal to the displacement at $B$ at the instant shown in fig. Hence $(b)$ is correct.
The phase difference between two points will be equal to $\frac{\pi }{2}$ if distance between them is equal to $\frac{\lambda }{4}.$
Between $A$ and $C,$ the distance is less than $\frac{\lambda }{2}.$ It may be equal to $\frac{\lambda }{4}.$
Hence, phase difference between these two points may be equal to $\frac{\pi }{2}.$
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