Light Sources and Filters

Question 1

what is “emission of light due to heat”

Answer 1

incandescence

Question 2

what is a black body radiator

Answer 2

incandescence of a perfectly black object, where the spectral output is totally defined by temperature

Question 3

on the graph of a black body radiator, as temperature increases, the peak of spectra output shifts _____

Answer 3

left

Question 4

the color temperature term is specific to

Answer 4

black body radiators

Question 5

how is the term color temperature applied?

Answer 5

often used with incandescent sources to describe the ‘color’ in relation to a black body radiator of that temperature

Question 6

definition of correlated color temperature

Answer 6

the term used for any sources other than a blackbody radiator, commonly used for non-incandescent sources

Question 7

most of the energy in the incandescent sources bulb is in the _____ wavelengths

Answer 7

longer wavelengths

Question 8

why do fluorescent bulbs have a SPD that is spiky

Answer 8

energy absorption (UV absorbed by a phosphor) and re-emission at different wavelengths

Question 9

how do LEDs work?

Answer 9

by electroluminescence, a direct release of photons resulting from electrons passing through material

Question 10

1 ND (natural density) filter causes what reduction in light transmission

Answer 10

causes a 1 log unit reduction in light (transmission)