A pioneer or a trailblazer. Also, perhaps, an explorer.
The frequency and wavelength of the wave cannot change as it travels from one medium to another.
Light travels approximately 186,282 miles (299,792 kilometers) in one second.
Energy travels from one place to another during a wave motion. Particles in the medium may also oscillate in place as the wave passes through, but they do not permanently move from one location to another.
When light travels from one material to another, it can be reflected, refracted, or absorbed. The degree to which each of these behaviors occurs depends on the properties of the two materials and the angle at which the light intersects the interface between them.
Such a speed is technically called the speed of light, but it could also be defined as ~Mach 1000000.
what kind of person travels to places no one else has been
A Trailblazer or Pioneer.
The person is called an explorer. The word means a person who explores an unfamiliar area.
The book called 'Travels' is about one person's travels around the world and the things that they see. It is partly a biography and partly a travelogue.
it often changes form.
An Immigrant
Never.
When people say you have only got eyes for one person and nobody else it means that you are in love with the person and no one else.
A monologae is when one person is speaking like first person and there is no one else.
Yes, if that person is dead and they give a brain to some one else they are a donar.
No one else will know but you.
It is selfish because your soul connection is with that one person and no one else.