Light traveling through air at 3.00 · 108 m/s. reaches an unknown medium and slows down to 2.00 · 108 m/s. what is the index of refraction of that medium

Which branches of natural science include the study of an organism that lived 10 million years ago

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?