The semi-major axis of the current gps satellite orbits is approximately 26,559,800 meters. the faa is adding gps-like transmitters in a geostationary orbit, calculate the radius (eccentricity = 0) of the geostationary orbit.

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3