o Test at 1024x768

o Test on a Mac.

o Intensity readers should be constrained on the x-axis when in side-view.

o Should we show intensity readouts anywhere, or just wave values?
o Could show intensity on detectors instead of displacement (ask Noah P)
o Okay, I'll add a switch to detectors to show intensity.  Do we want to optionally show absolute values (or intensities) in the wave area (to give a more global idea of constructive and destructive interference)?
o I would leave it up to others whether we should show intensity in the wave
itself. I don't really have an opinion, but I would lean towards not doing
this, since there are already a lot of controls in this sim and I'm not sure
what this option would buy us. Maybe in an advanced pull-down menu??

o Add correct units to measuring tape.

o Add correct units to stopwatch.

o Barrier, multiple sources should disappear for rotate wave.

Wave Interference: notes from phet meeting 4-4-06
o When a barrier is present, it should be shown in side view as behind the wave.
o Show a dotted gray line on intermediate rotation graphic to signify the cross section.
o Faucets should be draggable.
o In particle mode, there should be a smaller number of red particles.
o For the photon panel, users should be able to view with or without arrow vectors.
o Should be able to view sound waves from the side.
o Photon vectors should not have their tail fixed at E=0, but their middle, so students don't confuse "y" with "E"

    - When you put up a barrier in sound, the particles to the right of the
barrier don't go through (this is correct), but the particles on the left of
the barrier penetrate the barrier. I suspect that there is a boundary
condition on the right side, but not the left?

- Issue with the light source. (you need coherent
light to get interference). The way this is actually done (I think) is to
shine a laser through a single slit (or pinhole) and make the light
diffract, creating circular wavefronts. Also a problem of scale, since the
light should be ~500nm.  Maybe none of this matters, but it's something I
noticed and should be solved if there is an easy solution.

- It looks like the particles run away from the speaker and then fill in
from behind. I know this is sort of an optical illusion, but there may be a
way to minimize this visual effect. I tried to follow a single particle and
it still looked like it was running away.

-  When you change the wavelength of light, it resets rather than continuing
with differently colored ripples.

Bug: When you turn the gun off, it goes to solid color rather than black.

 Bug: Cross section graphic shouldn't show in side-view (water waves only).

 The graph that shows the efield should have the arrows colored the same as the curve and possibly a place to choose vectors on or off but hard to say until we see the graph.
 >What does this mean?

Not easy (yet) to make the view angle box narrower.

A comment said "Detectors should have red x’s in the upper right corner to delete them."
>Did you mean Barriers?

All three views will rotate (Sound and Light show same thing on side as on top)
>I'm not sure how to visualize the intermediate graphics for sound & light.

Pressure waves are out of phase (particles are too slow to keep up with pressure).