Standing wave is formed on a string and graph of slope variation Vs position is given at successive instants t1, t2 & t3 for a part of the string. A, B, C are particles on the string as shown. B. B is node and A & C are two neighboring points on 'its' two sides. The maximum value of the slope is a.

| Column - I | Column - II |
| (A) Point A, Time t2 | (P) Displacement from the mean position is upwards |
| (B) Point A, Time t3 | (Q) Displacement from the mean position is downwards |
| (C) Point C, Time t1 | (R) Displacement from the mean position has its maximum (in magnitude) possible value at that point. |
| (S) Displacement from the mean position is zero |
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y – t graph

