Deck 7: Light and Color

Question 1

The substances responsible for the green color of leaves area class of compounds called:

A)chloroforms.
B)chlorophylls.
C)chlorofluorocarbons.
D)carotenes.
E)none of the above.

Answer 1

chlorophylls.

Question 2

What is the frequency of light emitted by a helium-neon laser with a wavelength of 632.8 nm and a speed of 3 × 10⁸ m\s?

A)4.74 × 10¹⁴ s ^{− 1}
B)4.74 × 10⁵ s ^{− 1}
C)1.58 × 10 ^{− 3} s ^{− 1}
D)2.11 × 10 ^{− 15} s ^{− 1}
E)1.58 × 10 ^{− 15} s ^{− 1}

Answer 2

4.74 × 10¹⁴ s ^{− 1}

Question 3

Energy of light is:

A)proportional to frequency and wavelength.
B)inversely proportional to frequency and wavelength.
C)proportional to frequency and inversely proportional to wavelength.
D)inversely proportional to frequency and proportional to wavelength.

Answer 3

proportional to frequency and inversely proportional to wavelength.

Question 4

Arrange these spectral regions in order of increasing frequency  (x-rays, microwaves, ultraviolet, visible).

A)microwaves < visible < ultraviolet < x-rays
B)microwaves < visible < x-rays < ultraviolet
C)ultraviolet < x-rays < visible < microwaves
D)ultraviolet < visible < x-rays < microwaves
E)x-rays < microwaves < ultraviolet < visible

Question 5

Which of these scientists is credited with the discovery of x-rays?

A)Bohr
B)Hertz
C)Heisenberg
D)Roentgen
E)Einstein

Question 6

Which of the following is true when comparing infrared light to visible light?

A)Infrared light has a longer wavelength than visible light.
B)Infrared light has a lower frequency than visible light.
C)Infrared light has a lower energy than visible light.
D)All of the above.
E)None of the above.

Question 7

Which of these statements is not true concerning the nature of light?

A)Light has both particle and wave characteristics.
B)Particles of light are collectively called photons.
C)Light travels faster in space than it does on earth.
D)The wave nature of light has both a magnetic and an electrical component.
E)The wavelength of light is inversely proportional to the frequency of light.

Question 8

Arrange these spectral regions in order of increasing energy  (infrared, microwaves, ultraviolet, visible).

A)microwaves < infrared < visible < ultraviolet
B)microwaves < visible < infrared < ultraviolet
C)ultraviolet < infrared < visible < microwaves
D)ultraviolet < visible < infrared < microwaves
E)infrared < microwaves < ultraviolet < visible

Question 9

Wavelength of light is:

A)proportional to frequency and energy.
B)inversely proportional to frequency and energy.
C)proportional to frequency and inversely proportional to energy.
D)inversely proportional to frequency and proportional to energy.

Question 10

Arrange these spectral regions in order of increasing wavelength (infrared, radio waves, ultraviolet, visible).

A)radio waves < infrared < visible < ultraviolet
B)radio waves < visible < infrared < ultraviolet
C)ultraviolet < infrared < visible < radio waves
D)ultraviolet < visible < infrared < radio waves
E)infrared < radio waves < ultraviolet < visible

Question 11

Which of these statements is\are  true ?
I. As wavelength increases frequency decreases.
II. As energy increases frequency decreases.
III. As wavelength increases energy decreases.
IV. The product of wavelength and frequency is constant.

A)I, III, and IV
B)I and II
C)I, II, and IV
D)III and IV
E)II, III, and IV

Question 12

Which of these is not a characteristic of light?

A)Wavelength
B)Frequency
C)Energy
D)Amplitude
E)All of these are characteristics of light.

Question 13

If wave 1 has a wavelength that is half that of wave 2, which of the following is correct?

A)Wave 1 has a frequency and energy that is twice that of wave 2.
B)Wave 1 has a frequency and energy that is half that of wave 2.
C)Wave 1 has half the frequency and twice the energy of wave 2.
D)Wave 1 has twice the frequency and half the energy of wave 2.
E)Not enough information is given.

Question 14

Which of these characteristics of light is responsible for determining its color?

A)Magnetic component
B)Electrical component
C)Speed
D)Amplitude
E)Wavelength

Question 15

Tiny packets of energy which travel at the speed of light are known as ____.

A)photons
B)X-rays
C)carotenes
D)chlorophylls
E)gamma rays

Question 16

Which of these scientists is credited with the discovery of radio waves?

A)Bohr
B)Hertz
C)Heisenberg
D)Roentgen
E)Einstein

Question 17

An FM radio station, broadcasts at a frequency of 1.039 × 10⁸ s ^{− 1}. What is the wavelength of the radio waves, in meters? c = 3 × 10⁸ m\s

A)0.346 m
B)2.89 m
C)3.11 × 10⁸ m
D)3.11 × 10¹⁶ m
E)3.0 × 10 ^{− 9} m

Question 18

The speed of light is 3.0 x 10⁸ ____.

A)meters per second
B)miles per hour
C)kilometers per second
D)kilometers per hour

Question 19

The speed of light ______________.

A)increases as frequency increases
B)increases as wavelength increases
C)is constant
D)none of the above

Question 20

Which of the following is true when comparing ultraviolet light to visible light?

A)Ultraviolet light has a longer wavelength than visible light.
B)Ultraviolet light has a lower frequency than visible light.
C)Ultraviolet light has a lower energy than visible light.
D)All of the above are true.
E)None of the above are true.

Question 21

The slow emission of light by a glow in the dark toy or watch is best described as ____.

A)photodecomposition
B)phosphorescence
C)fluorescence
D)spectroscopy
E)Both B and C are correct.

Question 22

Which of these processes is\are responsible for the breaking of bonds within a molecule?
I. Photodecomposition
II. Fluorescence
III. Emission of heat

A)I only
B)I and II
C)II and III
D)I and III
E)I, II, and III

Question 23

Which of these forms of electromagnetic radiation is used in the treatment of cancer tumors?

A)Gamma rays
B)Infrared
C)Ultraviolet
D)Microwaves
E)All of the above

Question 24

Which of these statements best describes the difference between traditional spectroscopy and NMR?

A)Spectroscopy requires that the sample be in a magnetic field.
B)NMR utilizes high energy electromagnetic radiation and spectroscopy does not.
C)NMR utilizes the transitions of hydrogen nuclei while spectroscopy utilizes transitions of electrons.
D)NMR and spectroscopy are essentially the same.
E)Both B and C are correct.

Question 25

The processes by which an excited electron returns to its ground state with the emission of energy is known as ____.

A)photodecomposition
B)electronic relaxation
C)spectroscopy
D)electronic degradation
E)microwave radiation

Question 26

Magnetic Resonance Imaging (MRI)is based on the spectroscopy of which of these substances ____.

A)hydrogen
B)carbon
C)oxygen
D)electrons
E)helium

Question 27

A graph which shows the change in transition of a nucleus as a function of radio wave frequency is known as a(n)____.

A)resonance frequency
B)absorption spectrum
C)relaxation time
D)emission spectrum
E)resonance imaging

Question 28

The rapid emission of light by an excited molecule is known as ____.

A)photodecomposition
B)phosphorescence
C)fluorescence
D)spectroscopy
E)Both B and C are correct.

Question 29

Which of these processes can an excited molecule undergo?
I. Photodecomposition
II. Emission of light
III. Emission of heat

A)I only
B)I and II
C)II and III
D)I and III
E)I, II, and III

Question 30

The key to obtaining an image, like in MRI, as opposed to a graph, like in NMR, is in creating:

A)a high resonance frequency.
B)a variable radio frequency.
C)a constant magnetic field.
D)a variable magnetic field.
E)an electrical current.

Question 31

Which of these is not a form of spectroscopy?

A)NMR
B)MRI
C)photochemistry
D)phosphorescence
E)fluorescence

Question 32

Which of these colors of visible light has the shortest wavelength?

A)Red
B)Green
C)Yellow
D)Blue
E)Violet

Question 33

Which of these forms of electromagnetic radiation can contribute to an increased risk of cancer?
I. Gamma rays
II. Infrared
III. Ultraviolet
IV. Microwaves

A)I only
B)I and II
C)II and III
D)I and III
E)I, II, and III

Question 34

The exact frequency which causes a transition in a nucleus is known as the ____.

A)resonance frequency
B)absorption frequency
C)relaxation time
D)emission frequency
E)resonance imaging

Question 35

Which of these colors of visible light has the lowest energy?

A)Red
B)Orange
C)Yellow
D)Blue
E)Violet

Question 36

Which of these processes could occur during electronic relaxation?
I. Photodecomposition
II. Fluorescence
III. Emission of heat

A)I only
B)I and II
C)II and III
D)I and III
E)I, II, and III

Question 37

Which of these forms of electromagnetic radiation has the highest energy?

A)X-rays
B)Microwaves
C)Gamma rays
D)Radio waves
E)Infrared

Question 38

The interaction of matter and light is known as ____.

A)photodecomposition
B)phosphorescence
C)fluorescence
D)spectroscopy
E)photochemistry

Question 39

Visible light ranges in wavelength from 400 ____ − 780 ____. The missing units are:

A)micrometers
B)kilometers
C)meters
D)millimeters
E)nanometers

Question 40

The emission of light by the relaxation of excited electrons is known as ____.

A)photodecomposition
B)phosphorescence
C)fluorescence
D)spectroscopy
E)Both B and C are correct.

Question 41

What type of laser is the Nd:YAG laser?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 42

How does LASER light differ from ordinary white light?
I. Laser light is hotter than white light.
II. Laser light is in phase.
III. Laser light is one color.
IV. Laser light is red.

A)II only
B)I and II
C)II and III
D)I, II, and III
E)II, III, and IV

Question 43

Which category of laser is usually the smallest?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 44

Which of these is not a medical application of lasers?

A)removal of skin cancer
B)reshaping of the cornea
C)surgery
D)removal of tumors using fiber optics
E)All of these are applications.

Question 45

Which of these is not a characteristic of laser light?

A)Light which is one color.
B)Waves which are in phase.
C)Light which is very intense.
D)Light which does not spread much.
E)Light which is a combination of wavelengths.

Question 46

Which of these is not an application of gas lasers?

A)destroying of tumors
B)visual effects
C)surveying
D)cutting guide
E)alignment tool

Question 47

Which category of laser has the unique feature of wavelength tunability?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 48

Solid-state lasers depend on a(n)____ distributed in a solid crystal.

A)gas
B)excited electron
C)nonmetal anion
D)metal cation
E)reflecting mirror

Question 49

Which of these is the primary difference in lasers?

A)The color of the light.
B)The nature of the lasing medium.
C)The intensity of the light emitted.
D)The wavelength of the light emitted.
E)The speed at which the light emitted travels.

Question 50

Which category of laser is also called diode lasers?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 51

Which of these is not an advantage of a laser scalpel?

A)It can make precise cuts.
B)It is relatively inexpensive.
C)Its wavelength can be varied for desirable effects.
D)It causes minimum damage to surrounding tissues.
E)It can be delivered through a fiber optic cable to difficult to reach locations.

Question 52

What type of laser is the argon ion laser?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 53

Which of these is the correct expansion of the acronym LASER?

A)Light Amplification by Stimulated Emission of Radiation
B)Light Accelerated by Spectroscopic Emission of Radiation
C)Light Accelerated by the Stimulated Emission of Radiation
D)Light Amplification by Spectroscopy Electromagnetic Radiation
E)Light Amplification by Spectroscopy of Excited electromagnetic Radiation

Question 54

Which of these is not an application of MRI?

A)Detecting diseased tissue
B)Mapping brain function
C)Imaging injured tissues
D)Destroying cancerous tumors
E)All of these are applications.

Question 55

The time required for a nucleus to return to its original orientation after a transition is known as:

A)resonance time.
B)transition time.
C)emission time.
D)absorption time.
E)relaxation time.

Question 56

Which of these is not an application of semiconductor lasers?

A)Scanners
B)Laser pointers
C)Laser scalpels
D)CD players
E)All of these are applications.

Question 57

Which category of laser utilizes organic substance  in a liquid solution?

A)Gas
B)Dye
C)Photon
D)Semiconductor
E)Solid-state

Question 58

Which of these is an application of lasers?

A)Compact discs
B)Surgery
C)Supermarket scanners
D)Surveying equipment
E)All of these

Question 59

What type of laser is the ruby laser?

A)Gas
B)Dye
C)Solid-state
D)Semiconductor
E)Photon

Question 60

Which of these is not an application of lasers?

A)Compact discs
B)Imaging tissues
C)Supermarket scanners
D)Surveying equipment
E)Aiming devices

Question 61

Which of these is not a medical application of lasers?

A)Destruction of tumors
B)Removal of birthmarks
C)Destroying kidney stones
D)Corrective eye surgery for near-sightedness
E)All of these are applications.