energy conservation in interference phenomenon

If on a taut string, we have a wave pulse travelling in the positive x direction with an amplitude A.... simultaneously, from the other end we have a wave pulse travelling in the negative x direction with amplitude -A (i.e., it is faced downwards)
At a certain time t, they will superimpose upon eachother, and if we take a photograph at that time, we will see a straight string, with no wave pulses in it.
What has happened to the energy of the two wave pulses? where did it go?
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 Where does energy go when you compress a spring? Does it magically disappear?

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 Quote by anjor If on a taut string, we have a wave pulse travelling in the positive x direction with an amplitude A.... simultaneously, from the other end we have a wave pulse travelling in the negative x direction with amplitude -A (i.e., it is faced downwards) At a certain time t, they will superimpose upon eachother, and if we take a photograph at that time, we will see a straight string, with no wave pulses in it. What has happened to the energy of the two wave pulses? where did it go?
Be careful! When the string is flat (no amplitude) is it stopped? Are you saying it has no energy because it has no amplitude?

AM

energy conservation in interference phenomenon

when the string is compressed, the energy is stored as the potential energy of the string.
Andrew,
i know... rather feel that there is something wrong in that statement, however i am not being able to explain it mathematically... could you please elaborate? The only force acting in this system is tension... the energy is stored as the potential energy of "tension"? then.. is the tension in the flat portion of the string different?

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