Are the transmitted and the reflected waves always in phase when they are at antinodes; and are always in antiphase when at nodes? Or is it the other way round? I don't understand why though. I don't get how standing waves can be in phase and in antiphase.
A stationary wave is a wave such that two waves with the same amplitude and frequency travelling in opposite directions meet and essentially counteract by kinda cancelling the other about.
By this I mean the net displacement away from the imaginary horizontal line through the centre of the resulting wave forme is 0 at all parts of the wave.
This would mean that if an antinode has a displacement (amplitude) of +3 away from the horizontal line then that would need to be counteracted by a wave with a displacement of -3 as you always add the displacements of the two waves meeting. This will result in an overall horizontal line on top of your existing imaginary line.
A node is a point in a wave where your amplitude is 0, so where it crosses your horizontal line.
An antinode is a point on a wave where the amplitude is at it's maximum.
'At these points, the two waves add with opposite phase and cancel each other out. They occur at intervals of half a wavelength (λ/2). Midway between each pair of nodes are locations where the amplitude is maximum. These are called the antinodes.'
I've confused myself now argh D: Someone else plz come help?! lol
Basically as both waves are traveling in opposite directions there can be a moment where they are completly in phase and a moment where they are completly out of phase