Physics Light And Color Test 9

Front 1

List the order of the EM spectrum from short wavelength to long wavelength.

Back 1

Cosmic, gamma, x-ray, ultra-violet, visible light, infrared, microwaves, radio waves

Front 2

why do photographers use red lights in their darkrooms?

Back 2

red has a low energy level

Front 3

what is the symbol used in an equation for the speed of light? what is the speed of light in m/s?

Back 3

c;3E8 m/s

Front 4

who determined that the energy of an electromagnetic waves and its frequency are proportional?

Back 4

Einstein

Front 5

A new anti terrorist technique detects the differences in electromagnetic waves by humans and by weapons made of metals, plastic, or ceramic. one possible range of wavelengths used with this technique is from 2-5mm. calculate the associated range of frequencies

Back 5

3E8=f(.005) 3E8=f(.005)

1.5E11Hz-6E10Hz

Front 6

list 4 wave behaviors.

Back 6

reflection, refraction, diffraction, interference

Front 7

define the wave behaviors and give an example of each.

Back 7

reflection-bouncing; mirrors
refraction-bending; a pencil in a glass of water
diffraction-spreading out; sunglass, waves on the bottom of the pool
interference-constructive and destructive; patterns of light that can be viewed on a screen.

Front 8

how can you tell if a pair of sunglasses has polarizing lenses?

Back 8

hold at a right angle to a known pair of polarizers.

Front 9

is light from the sky polarized?

Back 9

NO

Front 10

define the photoelectric effect.

Back 10

ability to create an electric current in a metal from light.

Front 11

if bright yellow and dim yellow were to shine on the same photocell, which would eject more electrons?

Back 11

bright

Front 12

if bright yellow and dim green light shine on a photocell, which will emit electrons having a high energy?

Back 12

green

Front 13

define photon.

Back 13

particle of light

Front 14

if an electron moves to a higher quantum state it must _______ a photon.

Back 14

absorb

Front 15

if an electron moves to a lower quantum state it must ______ a photon.

Back 15

emit

Front 16

list the primary colors of light.

Back 16

blue, red, green

Front 17

list the secondary colors of light.

Back 17

magenta, yellow, cyan

Front 18

define complementary colors.

Back 18

primary and secondary colors of light that form white when seen together.

Front 19

cyan and yellow paint

Back 19

green

Front 20

blue and yellow light

Back 20

white

Front 21

pure blue and pure yellow paint

Back 21

black

Front 22

green and red light

Back 22

yellow

Front 23

pure green and pure blue pigment

Back 23

black

Front 24

opaque magenta shirt and white light

Back 24

magenta

Front 25

opaque magenta shirt and red light

Back 25

red

Front 26

opaque magenta shirt and cyan light

Back 26

blue

Front 27

opaque magenta shirt and green light

Back 27

blue

Front 28

opaque magenta shirt and yellow light

Back 28

red

Front 29

a substance is known to reflect green and blue light. what color would it appear to be when it is illuminated by white light? by blue light?

Back 29

cyan; blue

Front 30

brown is a mixture of yellow with small amounts of red and green. if you shine red light on a brown woolen blanket, what color will the blanket appear? will it appear lighter or darker than is would under white light?

Back 30

red; darker

Front 31

a lens for a spotlight is coated so that it does not transmit yellow light. if the light source is white, what is the resulting color of the spotlight?

Back 31

blue

Front 32

a house is painted with pigments that reflect red and blue light but absorb all other colors. what color does the house appear to be when it is illuminated by white light? what color does it appear to be under red light?

Back 32

magenta; red

Front 33

what pigments would an artist need to mix to obtain a yellow-green color? what would a theatre-lighting designer need to mix in order to produce the same color with light?

Back 33

yellow, cyan; red, green