finals-quantitative properties of light

Question 1

Defined as the flow of light

Answer 1

luminous flux

Question 2

symbol for luminous flux

Answer 2

Φ

Question 3

SI unit of luminous flux

Answer 3

lumen (lm)

Question 4

Luminous Flux is equivalent to

Answer 4

flow in plumbing

Question 5

A lamp receives watts and
emits lumens. The measure
of success of doing this is
called?

Answer 5

efficacy

Question 6

measurement for efficacy is?

Answer 6

lm/w (lumens per watt)

Question 7

is the quantity of light emitted by a light source, regardless of
direction or distribution

Answer 7

luminous flux

Question 8

symbol for illuminance

Answer 8

E

Question 9

density of luminous flux
incident on that surface

Answer 9

illuminance

Question 10

illuminance is measured in?

Answer 10

lumens per square meter (lm/m2)

Question 11

SI unit of illuminance

Answer 11

lux (lx)

Question 12

1 lux = (?)

Answer 12

1 lumen per square meter

Question 13

1 footcandle = (?)

Answer 13

1 lumen per square foot

Question 14

Average illumination
of a surface is
luminous flux
per unit area.

Answer 14

illuminance

Question 15

The visible radiant intensity in a particular
direction is called

Answer 15

luminous intensity

Question 16

symbol of luminous intensity?

Answer 16

I

Question 17

si unit of luminous intensity

Answer 17

candela (cd)

Question 18

is the measure of light output in a specified direction

Answer 18

light intensity

Question 19

symbol of luminance

Answer 19

L

Question 20

is the brightness of an
illuminated or luminous surface as perceived
by the human eye.

Answer 20

luminance

Question 21

unit of measurement of luminance

Answer 21

cd/m2 (candelas per square meter)

Question 22

is the measure of the brightness of a surface, as seen by the eye?

Answer 22

luminance

Question 23

depends on the surface size seen and the light intensity, reflected by the surface towards the eye?

Answer 23

luminance

Question 24

Ability of source to produce
light in a given direction

Answer 24

luminous intensity

Question 25

Total amount of light

Answer 25

luminous flux

Question 26

Amount of light received on a unit area of surface

Answer 26

illuminance

Question 27

Density of light reflected or transmitted from a surface

Answer 27

luminous exitance

Question 28

candela indicates the strength of the light emission

Answer 28

luminous intensity

Question 29

lumen describes the amount of light that is radiated

Answer 29

luminous flux

Question 30

lux indicated the illumination intensity of an area

Answer 30

illuminance/illumination