I am doing a Phet hydrogen simulation to figure out how an atom works. there is one question that I don't know the answer:

I am doing a Phet hydrogen simulation to figure out how an atom works. there is one question that I don't know the answer: "When determining how an atom works, scientists witnessed something similar to what you are witnessing now. They then deduced how the atom must be organized. What do you think is making the photons deflect? Is every color deflected?" So in the experiment there are some photons (of different wavelengths) being "shot" to an atom, some of the photons are deflected, while some of them just pass through the atom. so my questions are:

1. Why the photons are deflected in the first place? Is it because they hit the electrons in the atom?
2. what is the reason that some photons are deflected and some others are not? does wavelength have something to do with this?

Thanks