the more infrared radiation it gives out in a given time the greater the proportion of emitted radiation is visible light There are no known objects that are perfect at absorbing or emitting all ...

IT is well known that the study of the absorption spectrum of elements provides us with the simplest method of determining the normal states of atoms. In the hands of Wood, Bevan, McLennan ...

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Although sunlight appears to be a full continuous spectrum when viewed with a spectroscope, more detailed observation shows black narrow lines. These 'Fraunhofer' lines are due to the absorption ...