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Lumen (unit): Quiz


Question 1: A standardized procedure for testing projectors has been established by the ________, which involves averaging together several measurements taken at different positions.
International Organization for StandardizationAmerican National Standards InstituteFortranC (programming language)

Question 2: The lumen (symbol: lm) is the ________ unit of luminous flux, a measure of the power of light perceived by the human eye.
Metric systemSystems of measurementConversion of unitsInternational System of Units

Question 3: That is, a light source that uniformly radiates one ________ in all directions radiates a total of 4π lumens.
Photometry (optics)CandelaLuminous intensityLux

Question 4: A 23 watt ________ emits about 1500–1600 lm.
Light-emitting diodeCompact fluorescent lampLED lampIncandescent light bulb

Question 5: If a light source emits one ________ of luminous intensity uniformly across a solid angle of one steradian, its total luminous flux emitted into that angle is one lumen.
Luminous efficacyPhotometry (optics)CandelaLumen (unit)

Question 6: Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different ________ of light.
WavelengthDiffractionElectronElectromagnetic radiation

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