Wavefunction collapse is when a quantum states' wavefunction is disturbed by an observer just by observing it. The position or momentum prior to observation is completely changed

A wavefunction is a representation of the state of a quantum system. A quantum state is a vector belonging in an abstract space (the Hilbert space), while a wavefunction is a complex function given in terms of a Hermitian variable (usually position or momentum). When "wavefunction" is used unqualified (as opposed to "wavefunction in momentum space"), it is taken to mean the wavefunction in terms of position. In case of single-particle systems, the modulus squared of the wavefunction at a given position represents the probability density of the particle to be at that position.

We would need to know what wavefunction to respond to this question.

One of many, many possibilities would simply be y = sin x.

Partial of it does. I think your question is leaning towards wavefunction. It is pretty hard to get but with study you will eventually get it. Since I'm twelve I got the whole day. If i explain it here is would be hard to understand. On google or something else, look up the double slit experiment. It was an experiment created by Thomas Young, that was meant to explain if light was a stream of particles, or waves(today it's a photon a combination of both). It turns out that the the human observation collapse the wavefunction of subatomic particles. All I can tell you is this, wavefunction is basically the chance of the position and momentum of subatomic particles. You can't have a definite answer to both of them. You either know more about the position and less about the momentum and vise versa. Hope this helps.

An exciplex is an excited state whose wavefunction overlaps a neighboring, dissimilar molecule. In contrast to an exciplex, an excimer is an emissive excited state whose wavefunction overlaps two adjacent molecules of like composition.