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## Homework Statement

A stationary wave travels along a stretched string. Part of this wave at a particular

instant is shown.

https://www.google.co.id/imgres?imgurl=http://1.bp.blogspot.com/-0ltZhcjZgMk/VFjPCek0qDI/AAAAAAAAFpQ/v5tEMYIVsrQ/s1600/stationary-wave-june2011p23q6c.png&imgrefurl=http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-7.html&docid=o0LHAI0i1F88PM&tbnid=cX0R4qmI0GkYfM:&w=917&h=272&bih=667&biw=1366&ved=0ahUKEwjrpYGWv7rMAhWFFqYKHXJEAB8QMwhOKCkwKQ&iact=mrc&uact=8

The period of vibration of this wave is 20 ms. Sketch the stationary wave 10 ms after the instant shown.

## Homework Equations

stationary wave

## The Attempt at a Solution

I think the wave will be reversed after moving half period. Let say the equation of the wave is sin, then after moving for 10 ms the equation will be - sin. But the answer says that the graph will be horizontal line. I don't understand how it can be horizontal line only (I assume the answer means that all the amplitude is zero)

Thanks

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