Identify a suitable wavelength for analysis of Cu2+ ions in aqueous solution. The radiant intensity of light is highest in the middle of the visible range, and falls off dramatically at long wavelengths (700 nm).

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter