Chapter 6

Question 1

the form of energy detected by our ears

Answer 1

sound

Question 2

sound is carried by

Answer 2

waves

Question 3

sounds needs a

Answer 3

medium

Question 4

speed of sound depends on these two things

Answer 4

temperature and density of the medium

Question 5

sound travels at _____ in air

Answer 5

338 m/s

Question 6

sound travels at _____ in water

Answer 6

1500 m/s

Question 7

sound travels at _____ in wood

Answer 7

3850 m/s

Question 8

sound travels at _____ in iron

Answer 8

5955 m/s

Question 9

speed and temperature have a ______ relationship

Answer 9

Direct

Question 10

speed and density have a ______ relationship

Answer 10

direct

Question 11

pitch and frequency have a ______ relationship

Answer 11

direct

Question 12

pitch is

Answer 12

how high or low a tone sounds to our ears

Question 13

frequency is

Answer 13

the amount of cycles per second of the sound wave

Question 14

frequency is measured in

Answer 14

Hertz (Hz)

Question 15

young children can hear from

Answer 15

20 to 20000 Hertz

Question 16

as we age our eardrums become less elastic and the ____ is reduced

Answer 16

upper limit of frequency

Question 17

wavelength and frequency have a ______ relationship

Answer 17

indirect

Question 18

waves that are too low for us to hear are called

Answer 18

infrasonic waves

Question 19

waves that are too high for us to hear are called

Answer 19

ultrasonic waves

Question 20

the response of your ear to the intensity of a sound wave is called

Answer 20

loudness

Question 21

loudness is measured in

Answer 21

decibels

Question 22

the threshold of hearing is

Answer 22

0 decibels

Question 23

normal conversation is

Answer 23

60 decibels

Question 24

the threshold of pain is

Answer 24

120 decibels

Question 25

loudness and amplitude have a ______ relationship

Answer 25

Direct

Question 26

amplitude is

Answer 26

the height of a wave

Question 27

determines the note people hear

Answer 27

fundamental tone

Question 28

shorter faster vibrations accompanying the fundamental tone

Answer 28

overtones

Question 29

the effect on sound is called

Answer 29

acoustics

Question 30

the transfer of energy from one object to another object that the same natural frequency is called

Answer 30

resonance

Question 31

the Doppler effect is

Answer 31

would the pitch of a sound reaching your ear varies if you are the source of the sound are In Motion

Question 32

sonar stands for

Answer 32

sound navigation and ranging

Question 33

sonar uses

Answer 33

sound waves traveling through water to locate underwater materials and they are reflected if they hit a solid

Question 34

ultrasounds are

Answer 34

low intensity impulse waves that can be sent into the body and Echoes detected are used to draw an image. these have no harmful effects.

Question 35

electromagnetic waves are

Answer 35

energy and waveform that is capable of traveling through a vacuum

Question 36

the highest point of a wave is called

Answer 36

the crest

Question 37

the lowest point of a wave is called

Answer 37

the trough

Question 38

the distance from one Crest to next is called the

Answer 38

wavelength

Question 39

all electromagnetic waves travel at the speed of

Answer 39

light

Question 40

light is a _____ wave

Answer 40

light

Question 41

sound is a ____ wave

Answer 41

mechanical

Question 42

sound cannot travel through

Answer 42

a vacuum

Question 43

the three additive primary colors of light are

Answer 43

red blue and green

Question 44

the three primary pigment colors also known as the subtractive primary colors are

Answer 44

yellow magenta and cyan

Question 45

a pigment is

Answer 45

a colorful material that is used to change the color of other substances

Question 46

luminous objects ____ light waves

Answer 46

emit

Question 47

illuminated objects ______ light waves

Answer 47

reflect

Question 48

speed of light and density of the medium have a ______ relationship

Answer 48

indirect

Question 49

the distance light travels in a year is called

Answer 49

a light year

Question 50

intensity is

Answer 50

a measure of how bright a light from the light source is

Question 51

intensity is measured in

Answer 51

Candelas (cd)

Question 52

illumination and intensity have a ______ relationship

Answer 52

direct

Question 53

illumination and distance from the source have a ______ relationship

Answer 53

indirect

Question 54

light travels in

Answer 54

straight lines

Question 55

Ray Optics is

Answer 55

the study of movement of light in straight lines

Question 56

an incident Ray is

Answer 56

an incoming ray

Question 57

a reflected ray is

Answer 57

an outgoing ray

Question 58

a normal Ray is

Answer 58

a line drawn perpendicular to the surface at the point at which Rays strike and is used for measuring angles

Question 59

angle of incidence

Answer 59

angle between normal and incident Ray

Question 60

angle of reflection

Answer 60

angle between normal and reflected ray

Question 61

Law of Reflection

Answer 61

the angle of incidence is equal to the angle of reflection

Question 62

concave mirrors

Answer 62

are upside down or inverted images that are the real images because light rays actually passed through the image. These are used in reflecting telescopes flashlights spotlights and auto headlights

Question 63

Refraction is

Answer 63

the bending of light as it enters a new medium

Question 64

lenses use the property of reflected light

Answer 64

magnify or reduce images

Question 65

the separation of white light into its differently coloured light waves is called

Answer 65

dispersion

Question 66

raindrops act as ____ to make rainbows using ______

Answer 66

concave mirrors | dispersion