|
brightness
has definitions from the fields of physics,psychology
|
|
| 1 |
[ noun ] the location of a visual perception along the black-to-white continuum
Used in print (Cornell H. Mayer, "Radio Emission of the Moon...)The quiescent level of centimeter wave-length solar_radiation would increase the average disk brightness temperature by less than 1 ` K . Not all the observers have used the same procedures or made the same assumptions about the lunar brightness distribution when reducing the data , and this , together with differences in the methods of calibrating the antennae and receivers , must account_for much of the disagreement in the measured radio_brightness temperatures . In the observations at 4.3 mm ( Coates , 1959 a ) , the diameter of the antenna beam , 6 ' .7 , was small enough to allow resolution of some of the larger features of the lunar surface , and contour diagrams have been made of the lunar brightness distribution at three lunar phases . The ratio of the measured antenna temperature_change during a drift scan across the moon to the average brightness temperature of the moon over the antenna beam ( assuming that the brightness temperature of the sky is negligible ) was found , by graphical integration of the antenna directivity diagram , to be 0.85 . The ratio of the measured antenna temperature_change during a drift scan across the moon to the average brightness temperature of the moon over the antenna beam ( assuming that the brightness temperature of the sky is negligible ) was found , by graphical integration of the antenna directivity diagram , to be 0.85 . |
| 2 |
[ noun ] (psychology) intelligence as manifested in being quick and witty
Synonyms Related terms |
| 3 |
[ noun ] (physics) the quality of being luminous; emitting or reflecting light
Synonyms Examples "its luminosity is measured relative to that of our sun" Related terms physical_property luminescence illuminance incandescence light bright dull |
| * |
|