A series of pulses, each of amplitude 0.300 m, are sent down a string that is at

Question

A series of pulses, each of amplitude 0.300 m, are sent down a string that is attached to apost at one end. The pulses are reflected at the post and travelback along the string without loss of amplitude. When two waves arepresent on the same string, the net displacement of a particularelement of the string is the sum of the displacements of theindividual waves at that point. (a) What is the net displacement of an elementat a point on the string where two pulses are crossing, if thestring is rigidly attached to the post?
1 m
(b) What is the net displacement if the end at which reflectionoccurs is free to slide up and down?
2 m (a) What is the net displacement of an elementat a point on the string where two pulses are crossing, if thestring is rigidly attached to the post?
1 m
(b) What is the net displacement if the end at which reflectionoccurs is free to slide up and down?
2 m

Explanation / Answer

a) If the pulses hit a post, that is a fixed end, they reflectinverted back along the string destructive interference where pulses meet (for convenientreference, assume close to the post) 0.000 m displacement b) If the pulses meet a free end, that is they slide up an down,then they reflect back erect along the string, and constructiveinterference occurs 0.600 m displacement

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