Waves ( properties of waves )

Question 1

what do waves do

Answer 1

transfer energy from one place to another without transferring matter

Question 2

when do waves happen

Answer 2

when an oscillation travels from the starting point

Question 3

the direction a wave travels is called

Answer 3

the direction of propagation

Question 4

when a wave travels through a medium, what do the particles do

Answer 4

they oscillate and transfer energy between each other

Question 5

when waves transfer energy, do the particles move or don’t ?

Answer 5

they don’t, only the energy is transferred

Question 6

the amplitude of a wave is

Answer 6

the maximum displacement of a point on the wave from its undisturbed position

Question 7

the wavelength

Answer 7

is the distance between the same point on two adjacent waves

Question 8

frequency is

Answer 8

the number of complete waves passing a certain point per second

Question 9

frequency is measured in

Answer 9

Hz (Hertz)

Question 10

sign for wavelength

Answer 10

λ

Question 11

all waves are either (2)

Answer 11

transverse or longitudinal

Question 12

in transverse waves,

Answer 12

the vibrations are perpendicular to the direction of energy transfer

Question 13

transverse waves can travel in ( what mediums) when they are mechanical waves

Answer 13

solids and SURFACES of liquids

Question 14

when electromagnetic wave, transverse waves can travel through

Answer 14

solids, liquids and gases and vacuum

Question 15

on a transverse wave, the highest point above resit position is called the

Answer 15

crest

Question 16

in a transverse wave, lowest point below the rest position is called a

Answer 16

trough

Question 17

most waves are ( transverse or longitudinal)

Answer 17

transverse

Question 18

longitudinal waves have vibrations that

Answer 18

vibrations that are parallel to the direction of energy transfer

Question 19

example of longitudinal waves

Answer 19

sound waves, ultrasound

Question 20

the oscillations of longitudinal waves, oscillate in the ( direction)

Answer 20

the same direction as the direction of wave travel

Question 21

longitudinal waves move in / through (what meidums)

Answer 21

Move in solids, liquids and gases

Question 22

can longitudinal waves move through a vacuum

Answer 22

no

Question 23

wave speed is

Answer 23

the speed at which energy is being transferred

Question 24

wave equation is ( worded)

Answer 24

wave speed = frequency x wavelength

Question 25

wave equation in symbol

Answer 25

v = f λ

Question 26

wave speed is measured in

Answer 26

m /s

Question 27

wavelength is measured in

Answer 27

metres

Question 28

wave vibrations for a transverse wave can be shown on a

Answer 28

rope

Question 29

wave vibrations of a longitudinal wave can be shown on a

Answer 29

spring

Question 30

key features of a longitudinal wave ( 2)

Answer 30

close together, = compressions far apart = rarefractions

Question 31

density of transverse waves does what

Answer 31

stays constant

Question 32

density of longitudinal waves does what

Answer 32

changes

Question 33

pressure in transverse waves does what

Answer 33

stays constant

Question 34

pressure in longitudinal waves does what

Answer 34

changes

Question 35

the speed of a longitudinal wave is fastest when it moves through a

Answer 35

solid

Question 36

the speed of a transverse wave is fastest when it travels through

Answer 36

a vacuum

Question 37

waves are described as

Answer 37

oscillations or vibrations about a fixed point

Question 38

amplitude is measured in

Answer 38

metres

Question 39

in a transverse wave, wavelength can be measured from

Answer 39

one peak to the next peak

Question 40

in a longitudinal wave, wavelength can be measured from

Answer 40

he centre of one compression to the centre of the next

Question 41

wave period

Answer 41

The time taken for a single wave to pass a point

Question 42

wavefront is

Answer 42

​An imaginary surface representing points of a wave that are at the same point in their cycle

Question 43

waves with a higher frequency have high/low energy

Answer 43

high

Question 44

equation relating time period and frequency

Answer 44

FREQUENCY = 1 / Time period

Question 45

what is the doppler effect

Answer 45

the apparent change in observed wavelength and frequency

Question 46

the doppler effect can be observed when ?

Answer 46

whenever sources of waves move

Question 47

how does the frequency change in the doppler effect

Answer 47

changes from high to low as the waves move closer and further

Question 48

when a stationary object emits waves, the waves spread out ___

Answer 48

systematically

Question 49

To an observes standing behind an object moving away from them, the waves appear to become

Answer 49

stretched apart because wavelength appears to get longer (and the frequency appears to get lower)

Question 50

reflection happens when

Answer 50

waves bounce off a surface

Question 51

what waves can be reflected

Answer 51

all waves

Question 53

refraction is when

Answer 53

a wave changes direction when it crosses a boundary between 2 materials at an angle to the normal.

Question 54

why does refraction happen

Answer 54

because the wave changes speed

Question 55

how much the wave is refracted depends on ? and what does that depend on

Answer 55

how much it sped up or slowed down the density of both materials

Question 56

what happens to frequency and wavelength in refraction

Answer 56

frequency stays the same wavelength changes

Question 57

what waves can be refracted

Answer 57

all waves