8.2-8.3

Question 1

an arrangement of all forms of electromagnetic radiation in order of frequency and wavelength

Answer 1

electromagnetic spectrum

Question 2

low-frequency electromagnetic waves widely used for communication

Answer 2

radio waves

Question 3

the highest frequency of radio waves are used by _______

Answer 3

cell phones

Question 4

waves of higher frequency and shorter wavelengths than radio waves

Answer 4

microwaves

Question 5

a device that uses reflected radio waves or microwaves to measure the distance and direction of faraway objects

Answer 5

radar

Question 6

an electromagnetic wave whose frequency is greater than that of microwaves and just below that of red visible light; sometimes called heat ray

Answer 6

infrared ray

Question 7

electromagnetic radiation with a frequency slightly higher than that of visible light; from lowest to highest frequency, divided into UVA, UVB, and UVC

Answer 7

ultraviolet radiation

Question 8

also called “heat rays”

Answer 8

infrared rays

Question 9

any form of electromagnetic radiation with a higher frequency than ultraviolet radiation

Answer 9

x-ray

Question 10

discovered by Wilhelm Roentgen

Answer 10

x-ray

Question 11

electromagnetic waves of extremely high frequency which are capable of penetrating nearly all substances

Answer 11

gamma rays

Question 12

showed that the energy of any electromagnetic wave is directly related to its frequency

Answer 12

Max Planck

Question 13

the process where a single photon is emitted by an excited electron

Answer 13

spontaneous emission

Question 14

glow with brilliant colors when illuminated by ultraviolet light

Answer 14

fluorescent

Question 15

demonstrate delayed spontaneous emission

Answer 15

phosphorescent

Question 16

the process of photon emission by stimulation of already-excited atoms

Answer 16

stimulated emission

Question 17

a device that generates and amplifies high-energy beams of light using stimulated emission

Answer 17

laser (light amplification by stimulated emission of radiation)

Question 18

a semicircular arc of colored bands of light that forms in the sky when millions of airborne water droplets act like tiny prisms

Answer 18

rainbow

Question 19

the mutual reinforcement or cancellation that occurs when two or more waves meet

Answer 19

interference

Question 20

the phenomenon in which colors are produced on the surface of an object by interference

Answer 20

iridescence

Question 21

the light fringe that results from constructive interference of light waves coming from different parts of a narrow slit

Answer 21

antinode

Question 22

the dark fringe that results from destructive interference of light waves coming from different parts of a narrow slit

Answer 22

node

Question 23

light coming from a single source and in a single wave train

Answer 23

coherent light

Question 24

a simple device that uses diffraction to produce spectra

Answer 24

diffraction grating

Question 25

any scientific technique that analyzes a substance or phenomenon by observing a light spectrum

Answer 25

spectroscopy

Question 26

refers to a beam of light containing waves that are all aligned in the same direction

Answer 26

polarized

Question 27

two examples that cause polarization

Answer 27

selective absorption and reflection

Question 28

three characteristics of lasers

Answer 28

monochromatic, coherent, and intense

Question 29

made the first laser called the ruby laser that produced only pulses of light

Answer 29

Theodore H. Maiman

Question 30

refers to light that consists of only one frequency

Answer 30

monochromatic

Question 31

the use of laser beams to transmit signals through narrow glass cables called optical fibers

Answer 31

fiber optics

Question 32

a three-dimensional image produced by laser light

Answer 32

hologram