# Wave question

1. Dec 1, 2016

### ravsterphysics

1. The problem statement, all variables and given/known data

I'm stuck on part ii).

2. Relevant equations

3. The attempt at a solution

I'm confused as to how I would know the direction the wave is travelling at one instant on the (sine) wave??

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2. Dec 1, 2016

### Staff: Mentor

The problem states that it is a stationary wave.

3. Dec 1, 2016

### ravsterphysics

ok, so does this mean y and z are travelling up if the wave is moving left to right? or is it moving down at points y and z since they're closest to the guy on the right?

4. Dec 1, 2016

### Staff: Mentor

Since it is a stationary wave, nothing is moving left or right. There are fixed nodes (points where the string doesn't move).

5. Dec 2, 2016

### ravsterphysics

okay so since it's a standing wave, the 'string' is moving up and down, so doesn't this mean that y and z are about to move up??

6. Dec 2, 2016

### haruspex

Even if it were a travelling wave, all the string does is move up and down. What moves left or right is the overall shape, perceived as though it were a rigid object. It is effectively an optical illusion. In a standing wave, the illusion is different.

Do you have an equation for a standing wave? You did not list any equations.