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Candela: Quiz


Question 1: Like other SI base units, the candela has an ________—it is defined by a description of a physical process that will produce one candela of luminous intensity.
Artificial intelligencePragmatismPhenomenalismOperational definition

Question 2: A 100 W ________ emits about 120 cd.
Incandescent light bulbFlashtubeCompact fluorescent lampFluorescent lamp

Question 3: The frequency chosen is in the visible spectrum near ________, corresponding to a wavelength of about 555 nanometers.
BlueYellowGreenOrange (colour)

Question 4: The ________ is most sensitive to this frequency, when adapted for bright conditions.
Sensory systemHuman eyeCiliary muscleSclera

Question 5: The Commission Internationale de l'Éclairage (International Commission on Illumination) and the CIPM proposed a “new candle” based on the luminance of a ________ (a black body) at the temperature of freezing platinum.
Planck constantEnergyPlanck's lawPhoton

Question 6: A common ________ emits light with a luminous intensity of roughly one candela.
Incandescent light bulbCandleLightingFluorescent lamp

Question 7: The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 ________ and that has a radiant intensity in that direction of 1683 watt per steradian.
JouleHertzPascal (unit)Volt


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