Serway_PSE_quick_ch18

Serway_PSE_quick_ch18 - Physics for Scientists and...

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Physics for Scientists and Engineers, 6e Chapter 18 – Superposition and Standing Waves
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Two pulses move in opposite directions on a string and are identical in shape except that one has positive displacements of the elements of the string and the other has negative displacements. At the moment that the two pulses completely overlap on the string, 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. the energy associated with the pulses has disappeared 2. the string is not moving 3. the string forms a straight line 4. the pulses have vanished and will not reappear
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The pulses completely cancel each other in terms of displacement of elements of the string from equilibrium, but the string is still moving. A short time later, the string will be displaced again and the pulses will have passed each other.
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Consider a standing wave on a string as shown in the figure below. Define the velocity of elements of the string as positive if they are moving upward in the figure. At the moment the string has the shape shown at the bottom of
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