PHS 208 Weeks 5-8

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

Color perceived in retina by 3 sets of cones:

Pigment R, Pigment G, Pigment B

The colors produced by passing through a prism are arranged in what order?

Red Orange Yellow Blue Indigo Violet (Roy G. Biv)

The electron Volt (eV) is the energy gained by an electron that moves across a positive voltage of _ volts

1.0 volts

Orange light of 620 nanometers has an energy of 1. 1 eV 2. 1.5 eV 3. 2 eV

2 eV

Visible light is made of photons in energy range around _ eV

2-3 eV

Visible light is composed of photons in the energy range of around

2-3 electron volts

Radiations shorter than _ nm can't be sensed by eye

400

The visible spectrum lies in the middle range with wavelengths between _ nm for blue and _ nm for red

400, 700

How much nanometers is violet light?

410 nanometers

The energy levels in mercury produce a strong green line at 1. 700 nanometers 2. 625 nanometers 3. 546 nanometers

546 nanometers

How much nanometers is red light?

680 nanometers

Light with wavelength longer than _ nm is invisible

700

What is the chromaticity curve?

A color triangle w/ 3 primary colors at each corner.

In light emission, if the electrons have well-defined energy levels, you observe 1. line spectra 2. a narrow spectrum 3. a broad spectrum

a narrow spectrum

What is complementary colors?

a pair of colors which can produce white passing through the white point (W)

Energy-photons create what?

a pulsating electromagnetic disturbance

What are phosphors?

absorb UV light and produce visible light

A red object appears "red" to the eye when illuminated with white light. Light from other colors is not seen by the eye because those colors are _

absorbed

A single wavelength light beam incident on a thin film can have the reflected beam either reinforced diminished depending on 1. angle of incidence 2. film thickness 3. all of the above 4. neither of the above

all of the above

If the thickness of oil on water exceeds about 0.5 micron (5/10,000 of a millimeter) the interference effects of white light will 1. become very pronounced and bright 2. become negligible, making the surface appear dark 3. all overlap, making the surface appear white or colorless

all overlap, making the surface appear white or colorless

Objects can absorb all colors except the colors of their _, which are reflected

appearance

Lower energies (longer wavelengths) _ detected by human eye. They can be detected by special _ sensors

are not, infrared

An unpolarized beam of light can be represented by two vector components of wave oscillations oriented 1. 180 degrees from each other 2. at right angles to each other 3. parallel to each other

at right angles to each other

Different portions of the sun's energy are absorbed in the _, _, and _.

atmosphere, water, glass

If the raindrops were made of a material whose refractive index was independent of wavelength (n = constant), the rainbow would: 1. be white 2. not change 3. be even more colorful

be white

When a pure blue object is illuminated with red light, the object appears 1. white 2. black 3. blue 4. red

black

If red (instead of blue) light was preferentially scattered, the sunsets would appear _

blue

The sunsets appear red because of preferential scattering of _

blue

Human daylight vision is most effective in the _ (550 nm) where the sun's energy spectrum is in the region of its maximum

blue-green

The conservation of angular momentum in light emission applies to 1. infrared radiation 2. x-rays 3. both of the above 4. neither

both of the above

Fluorescent tubes have an energy spectrum with a _ spectrum, and a series of _ and _ peaks in the red, blue, and green

broad, sharp and intense

If you change the gas in a neon light, you would 1. use a different spectrometer 2. change the color 3. increase the voltage

change the color

Light rays are made of photons where the energy ranges from a _

color

Our perception of color comes from the _ _ _ which enter the eye

composition of light

The order of colors is _

constant

What is Saturation/Chroma?

how much the hue dominates

What is a nanometer?

A unit of distance that is too small to be resolved

What is electron volt (eV)?

A unit of energy where energy gained by an electron that moves across a positive voltage of 1 volt

There are 3 receptors in the eye that respond to different wavelengths:

Blue-violet, orange-red, green

How is color produced?

Color is produced by the absorption of selected wavelengths of light by an object

What was the effect of the pair of glass slides pressed close together? 1. it created fringes in the glass 2. nothing happened

it created fringes in the glass

What is incandescent light?

light produced by temperature of object

If two polarizers have their orientation axes aligned parallel the first will absorb half the unpolarized light and the second will transmit 1. half the remainder of unpolarized light 2. one-quarter the remainder of unpolarized light 3. linearly polarized light

linearly polarized light

Infrared and radio waves are the _ wavelength side

long

As we move through the visible spectrum of violet, blue, green, yellow, orange and red, the wavelengths become _

longer

Light from the sun transmitted through a prism can be adjusted to give a spectrum of colors that consists of 1. red and green 2. red and blue 3. many colors from red to blue

many colors from red to blue

The ultraviolet portion of the sun's spectrum 1. penetrates 1000m of water 2. is not blocked by glass 3. both of the above 4. neither of the above

neither of the above

What is flux?

number of photons passing through a unit area in a unit time

The foam on a colored liquid is white because 1. of scattering at the many liquid-air interfaces 2. of dilution of the liquid 3. the selective absorption by the liquid

of scattering at the many liquid-air interfaces

The energy levels in the electron transition leading to light emission differ by 1. one unit of angular momentum 2. two units of angular momentum 3. one unit of linearly polarized light

one unit of angular momentum

Light going from lower refractive index air to high refractive index glass has a phase change in the reflected beam of 1. one-half wavelength 2. one wavelength 3. all of the above 4. neither of the above

one-half wavelength

Who discovered that light can be split into a prism?

Isaac Newton

Ultraviolet (UV), x-rays, and gamma rays are on _ wavelength side

short

What did you see when you pressed your fingers nearly close together? 1. two fingers close together 2. small lines in the space between the fingers 3. nothing

small lines in the space between the fingers

The wavelengths of visible light are _ than common objects

smaller

In a rainbow, each color emerges at different angles: red light emerges at 42 degrees, blue light at a _ angle

smaller (40 degrees)

For every color signal or flux of photons reaching the eye, _ ratio of response within the three types of cones is triggered. It is this ratio that permits the perception of a particular color

some

Which of the following is NOT a part of the electromagnetic spectrum? 1. radio waves 2. infrared radiation 3. X-rays 4. sound waves 5. gamma rays

sound waves

Higher energies (shorter wavelengths) can be seen by what?

special devices

With electric discharge in gases, light can be produced in a 1. broad spectrum 2. spectrum with sharp lines 3. intermediate spectrum

spectrum with sharp lines

In the electromagnetic spectrum, as the radiation changes from x-rays to visible light, the velocity: 1. increases 2. decreases 3. stays the same

stays the same

If you increase the intensity of a light source you increase 1. the amount of light emitted 2. the wavelength of light 3. the characteristic color of the light

the amount of light emitted

What is electromagnetic radiation?

the complete range of energies of electromagnetic waves from the lowest to the highest (from largest to smallest wavelengths), including, in order, radio, infared, visible light, ultraviolet, X-ray, and gamma ray waves.

The sensation of color depends on what?

the composition of light, which is a mixture of white light and colored light

Light can be emitted when electrons make the transition between two states. The photon energy is equal to 1. the sum of the energies of the two levels 2. the energy of the lower level 3. the difference of energy between the two levels

the difference of energy between the two levels

In infrared light, compared to ultraviolet light 1. electron transitions are not involved 2. the energies are higher 3. the energies are lower

the energies are lower

What is composition of light?

the energy spectrum of photons

What happened when you looked at a light source through both polarizers that were oriented perpendicular to each other? 1. nothing 2. the polarizers dimmed the light a little bit 3. the polarizers dimmed the light significantly 4. the polarizers were black where they crossed

the polarizers were black where they crossed

If we observe a rainbow when sunlight shines on rain, why don't we see a complete rainbow circle? 1. we are too far away from the rainbow 2. the reflection angle limits the arc length 3. we are too high off the ground

the reflection angle limits the arc length

What is dominant wavelength?

the single wavelength that is perceived by the human eye

Thomas Young described thin film colors due to light scattered from 1. pigments 2. top and bottom sides 3. air pores in the film

top and bottom sides

Light from sun is absorbed by earth's atmosphere in the _ and _ but some reaches the earth

ultraviolet, infrared

In thin-film interference colors, the colors change with 1. viewing angle of the observer 2. distance to the observer 3. temperature of the observer

viewing angle of the observer

What color is the shortest wavelength

violet

The eye responds to wavelengths in ONLY in _ light in the electromagnetic spectrum

visible

The receptors of the eye respond to light in the _ spectrum

visible

The sun's spectrum encompasses the _ spectrum

visible

Fluorescent lamps have mercury vapor which emits uv radiation. The tube is coated with phosphors which produce _

visible light

The light emitted by the sun falls within the _ region and extends beyond the red (into the infrared, IR) and the _ with a maximum intensity in the yellow

visible, ultraviolet (UV)

If we specify a _ in the visible range, we can attribute a color to it

wavelength

Light is electromagnetic waves with color identified by its _

wavelength

The signature of color is the _ of light

wavelength

The colored light may have a dominant _ or _

wavelength, hue

The preferential scattering of blue light causes the sky to be blue and the sunsets red. If the scattering by air molecules anddust was independent of wavelength (no preferential scattering) the color of the sky would be _

white

Rods explain what in dim light?

why we perceive colored objects as shades of grey

Is light reflected off the floor or a table polarized? 1. yes 2. no 3. I couldn't tell

yes

What does the signature of color tell us?

It identifies the color's location in the spectrum

What are cones?

Allow us to see different colors

What are rods?

Effective in dim light and sense differences in light intensity.

The intensity/brightness of light is defined by the what?

Flux

Can all colors be produced by mixing lights of the 3 primary colors?

NO

If a slightly curved convex lens is placed on a plane glass surface a series of colored circles are seen in reflected light. These are known as 1. Newton's Rings 2. Tyndall's Rings 3. Rayleigh's Rings

Newton's Rings

Does human vision distinguishes between polarized light and unpolarized light?

No

What are the 2 types of photosensitive cells?

Rods, cones

How do we represent all colors?

The chromaticity curve

As we move through the visible spectrum, what happens to the wavelengths?

The wavelengths become longer

Are all the colors of soap bubbles due to interference effects?

Yes

Yes or no: White light can be produced by two colors.

Yes

What is a hue?

a color or shade

When looking at a bright incandescent light bulb (household bulb) what kind of a spectrum did you see through your spectrometer? 1. a continuous spectrum (like a rainbow) 2. a continuous spectrum with some bright lines superimposed 3. just bright lines on a dark background

a continuous spectrum (like a rainbow)

When looking at a bright incandescent light bulb (household bulb) what kind of a spectrum did you see through your spectrometer? 1. a continuous spectrum (like a rainbow) 2. a continuous spectrum with some bright lines superimposed 3. just bright lines on a dark background

a continuous spectrum (like a rainbow)

When looking at a fluorescent bulb what kind of spectrum did you see through your spectrometer? 1. a continuous spectrum (like a rainbow) 2. a continuous spectrum with some bright lines superimposed 3. just bright lines on a dark background

a continuous spectrum with some bright lines superimposed

When looking at a fluorescent bulb what kind of spectrum did you see through your spectrometer? 1. a continuous spectrum (like a rainbow) 2. a continuous spectrum with some bright lines superimposed 3. just bright lines on a dark background

a continuous spectrum with some bright lines superimposed

Fluorescent lamps operate by what?

a gas dischargr

As energy of light increases, wavelength _

decreases

The saturation _ as the hue is deleted with white lite

decreases

The life of a light beam: it is created, it travels through space and it is 1. reemitted 2. red-shifted 3. destroyed

destroyed

A prism refracts and _

disperses

James Clerk Maxwell showed that light was a form of _ _

electromagnetic radiation

Electrons are bound to the atom with fixed 1. mass 2. energies 3. spin

energies

When light is emitted from an atom: 1. energy is conserved 2. mass is conserved 3. color is conserved

energy is conserved

True reflection of light from thin film exhibits various colors dependent on 1. film thickness 2. density 3. both

film thickness

Circularly polarized light reflected at the Brewster angle from a flat sheet of glass will be 1. fully polarized 2. partially polarized 3. absorbed

fully polarized

Fluorescent tubes are coated with what?

phosphors

Rods do NOT perceive what? What do they perceive instead?

photon energy. The flux of incident photons

Retina has _ cells that contain pigments to absorb visible light

photosensitive

The colors of an object depend on three factors: a) interference, b)preferential scattering of short waves, and c) 1. pigment absorption 2. out-of-phase waves 3. density variations

pigment absorption

Isaac Newton discovered that light could be split into many colors by a _

prism

The color _ can't be represented by a single wavelength of light since it's a mixture of light in the red and violet regions

purple

Which of the following colors could not be represented by a single wavelength of light? 1. blue 2. indigo 3. violet 4. purple

purple

What color is the longest wavelength?

red

When you make your own rainbow with a sprinkler or light reflected off a bottle, what is the outer color?

red

If you project colored lights on all walls using flashlights and a filter, you can obtain yellow with 1. red and green lights 2. red and blue lights 3. green and blue lights

red and green lights

What colors are used in a T.V. color monitor?

red, green, and blue

In the Blue Sky Activity, What color was the light coming out if you were staring directly at the flashlight through the glass?

red-ish or yellow

A rainbow not only refracts and disperses light it also 1. reflects 2. absorbs 3. transmits

reflects

The rainbow is produced by sunlight reflecting from raindrops. The raindrops also are: 1. scattering 2. absorbing 3. refracting and dispersing

refracting and dispersing

The amount of reflect light incident on two transparent materials depends on differences in: 1. refractive indices 2. density 3. atomic weight

refractive indices


संबंधित स्टडी सेट्स

Animal Behavior: Infanticide and Infanticidal animals

View Set

Week 12: Spirometry - Respiratory Physiology Lab

View Set

Introduction to Humanities - Mod 4

View Set

Cross-Cultural Psychology Moodle quizzes

View Set

Psych: Chapter 14 Social Thinking

View Set

history chapter 6-AIML, Morley Minto reforms,reversal of Partition

View Set

Brynn's The Industrial Revolution

View Set