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"Spectra" is embedded with links that will take you back to the appropriate parts of the above two sites. The classic colors red, orange, yellow, green, blue, and violet connect in a seemingly infinite number of shades, one blending smoothly into the next.
Together they constitute the "visual spectrum" (or "optical spectrum") because it is the part of the full spectrum that is seen with the human eye.
Our samples are now pre-treated at the University of Canterbury.
Here we examine the principal way in which astronomers have learned so much about the stars. Pass sunlight through a triangular prism or bounce it off the finely grooved surface of a compact audio disk and see it break merrily into a band of pure sparkling color, its "spectrum," familiar in the colors of a rainbow, in light glittering from newly fallen snow, in the rings and haloes around a partly- clouded Sun and Moon, in the flash of a cut diamond, and in so many other facets of nature.
Une série de date absolues a été obtenue par une équipe française pour les niveaux de sédiments qui étaient censés renfermer le fossile.
Ces datations réalisées grâce à la méthode du béryllium 10 / béryllium 9 ont permis d'établir que l'âge de Toumaï serait compris entre 6,8 et 7,2 millions d'années.
This provides an ideal method for determining when a glacier retreated from a region, hence exposing the ground beneath.
Technological developments in the last few decades have allowed more precise measurements of their concentration in terrestrial rock samples and this dating technique is becoming increasingly popular.