In the four pictures labeled (A)-(D) at the right are shown snapshots of waves o

Question

In the four pictures labeled (A)-(D) at the right are shown snapshots of waves on a long, taut string. The dashed line shows a picture of a part of the string at the time t = 0. The solid line e is a picture at a time a little bit later. Each of these pictures looks the same at t = 0, but the results differ because the parts of the string have different velocities at t = 0 in each case. For each of the four cases above, select one of the six patterns below as the correct velocity pattern to lead to the solid line displayed. (Note the arrows indicate mainly direction. Their lengths are scaled somewhat in proportion to their magnitude, but not strictly so.) For case A: For case B: For case C: For case D:

Explanation / Answer

since

v=d/t

(distance/time)

after using this formula we will get

Wave A will have velocity 3m/sec
Wave B will have velocity 2m/sec
Wave C will have velocity 1m/sec
Wave D will have velocity 6m/sec

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