Chapter 9 Test

Question 1

What causes waves?

Answer 1

something that vibrates

Question 2

waves ____ energy

Answer 2

carry
transmit

Question 3

waves carry ___ but not ___

Answer 3

energy
the matter with the wave

Question 4

what are the 2 types of waves

Answer 4

compressional
transverse

Question 5

do all waves need a medium to transfer energy

Answer 5

no

Question 6

what is the main example of a longitudinal/compressional wave

Answer 6

sound wave

Question 7

examples of transverse waves

Answer 7

water, radio, micro, infrared, light, uv, x, gamma

Question 8

what happens in reflection?

Answer 8

wave strikes an object then the wave bounces off the object

Question 9

What types of waves can be reflected?

Answer 9

all

Question 10

What must happen in order to see reflection?

Answer 10

light waves must reflect off an object and those waves must enter your eye

Question 11

What is the reflection of sound waves called?

Answer 11

echoes

Question 12

what is the law of reflection

Answer 12

angle of incidence = angle of reflection

Question 13

When does a wave bend?

Answer 13

refraction and defraction

Question 14

what happens in refraction? why?

Answer 14

the wave bends
because of a change in the waves speed when it goes from one type of medium to another at an angle

Question 15

___ waves can be refracted

Answer 15

all

Question 16

the ___ the rate of speed change of the wave, the ___ the wave refracts

Answer 16

greater
more

Question 17

when a wave enters a medium and slows down, the wave will refract ___ the normal line

Answer 17

toward

Question 18

when a wave enters a medium and the wave goes faster, the wave will refract ___ the normal line

Answer 18

away from

Question 19

what happens in diffraction

Answer 19

a wave bends around a barrier or through an opening

Question 20

___ waves can be diffracted

Answer 20

all

Question 21

short wavelengths diffract ___

Answer 21

less

Question 22

long wavelengths diffract ___

Answer 22

more

Question 23

the amount of diffraction depends on…

Answer 23

the size of a waves wavelengths
the size of the barrier or opening the wave encounters

Question 24

sound waves have ___ wavelengths

Answer 24

long

Question 25

light waves have ___ wavelengths

Answer 25

short

Question 26

AM radio waves have ___ wavelengths

Answer 26

longer

Question 27

FM radio waves have ___ wavelengths

Answer 27

shorter

Question 28

What happens in wave interference

Answer 28

two or more waves overlap and combine to form a new wave

Question 29

Can two waves be in the exact same place at the same time? Why or why not?

Answer 29

yes because they are energy not matter - this is what causes the interference

Question 30

What are the two types of interference

Answer 30

constructive destructive

Question 31

what is constructive interference?

Answer 31

when crests and troughs of two or more waves meet and combine forming a new wave

Question 32

what is destructive interference?

Answer 32

the crests and troughs of two or more waves meet oppositely of one another and cancel out part or all of the waves forming a new wave

Question 33

short wavelengths refract ___

Answer 33

more

Question 34

long wavelengths refract ___

Answer 34

less

Question 35

___ diffraction occurs if the wavelength is smaller than the object

Answer 35

less

Question 36

___ diffraction occurs if the wavelength is the same size as the object

Answer 36

more

Question 37

the amount of diffraction that occurs depends on...

Answer 37

how big the obstacle or opening is compared to the wavelength

Question 38

why can you hear the soundwaves from a classroom while down the hall but not see the lightwaves

Answer 38

the wavelengths of soundwaves are similar in size to a door opening sound waves diffract around the door and spread out the hallway light waves have a much shorter wavelength they are hardly diffracted at all by the door

Question 39

__ radio reception is often better than __ reception around tall buildings and natural barriers such as hills

Answer 39

AM FM

Question 40

What is natural frequency?

Answer 40

the frequency at which a material vibrates

Question 41

What three factors affect an object's natural frequency?

Answer 41

size shape type of material the object is made of

Question 42

what is resonance

Answer 42

the process where an object vibrates because it absorbs the energy of another wave at the object's natural frequency

Question 43

What is the wave velocity formula

Answer 43

v = λ x f

Question 44

What is the unit for velocity

Answer 44

m/s

Question 45

What is the unit for frequency

Answer 45

hertz (Hz)

Question 46

What is the unit for wavelength

Answer 46

m

Question 47

What is the unit for the period of the wave

Answer 47

s

Question 48

what are seismic waves

Answer 48

waves inside earth that cause the crust to move, bend, or break

Question 49

___ waves can be longitudinal or transverse

Answer 49

water, seismic

Question 50

where can seismic waves travel

Answer 50

through earth or along earth's surface

Question 51

how can waves differ

Answer 51

how much energy they can carry how fast they travel

Question 52

what do the properties of a wave depend on

Answer 52

the vibrations of the wave source the material in which the wave travels

Question 53

What do wave properties affect

Answer 53

how we see objects or hear sounds

Question 54

do all waves have wavelengths

Answer 54

yes

Question 55

what is a wavelength

Answer 55

the distance between one point on a wave and the nearest point just like it

Question 56

what is the symbol for wavelength

Answer 56

the greek letter lambda: λ

Question 57

what are you doing when you tune a radio to a certain station

Answer 57

choosing radio waves of a certain frequency

Question 58

what is frequency

Answer 58

the number of wavelengths that pass a fixed point each second (the number of times that a point on a wave moves up or down/ back and forth each second)

Question 59

1Hz = __

Answer 59

1/s

Question 60

what is period

Answer 60

the amount of time it takes one wavelength to pass a fixed point

Question 61

frequency and period are always ___

Answer 61

inversely proportional

Question 62

when a waves frequency increases the period of the wave ___

Answer 62

decreases

Question 63

if frequency increases the wavelength will ___

Answer 63

decrease

Question 64

which waves travel faster: light or sound

Answer 64

light

Question 65

What does the speed of a wave depend on

Answer 65

the type of medium the wave is traveling through

Question 66

sound waves travel fastest in ___, slowest in ___

Answer 66

solids gases

Question 67

sound tends to go faster in a medium at a ___ temperature

Answer 67

higher

Question 68

Light waves travel fastest in ___ and slowest in ____

Answer 68

vacuum solids

Question 69

what is the unit for wave speed

Answer 69

m/s

Question 70

the greater the amplitude of a wave, the ___ energy the wave will carry

Answer 70

more

Question 71

the amplitude of a wave measures the...

Answer 71

size of the disturbance from a wave

Question 72

What affects the speed of longitudinal and transverse waves?

Answer 72

state of matter temperature of matter type of medium

Question 73

How does the frequency of a wave affect the period of a wave?

Answer 73

they are inversely proportional

Question 74

How will the frequency of a wave affect the wavelength of a wave

Answer 74

they are inversely proportional as frequency decreases wavelength increases

Question 75

How does the velocity of a wave affect the frequency of a wave

Answer 75

they are directly proportional

Question 76

Three main notes about waves

Answer 76

waves carry energy waves carry the energy but not the matter with it all waves are caused by something vibrating

Question 77

The material through which a wave travels is called a ___

Answer 77

medium

Question 78

why do waves not go on forever?

Answer 78

energy will change forms

Question 79

If the amplitude of a wave changes, which also changes?

Answer 79

the energy the wave carries

Question 80

The process by which sound waves transfer their energy is called _____

Answer 80

conduction