Waves

Question 1

progressive wave definition

Answer 1

waves that transfer energy away from a source

Question 2

transverse vs longitudinal waves

Answer 2

transverse travel perpendicular to direction of energy transfer, longitudinal parralel

Question 3

wavelength deginition

Answer 3

Distance between two ADJACENT points on a progressive which are oscillating in phase

Question 4

restoring force

Answer 4

a force which acts to bring a particle to it’s equilibrium position after it’s been displaced

Question 5

amplitude definition

Answer 5

MAXIMUM displacement from the equilibrium point

Question 6

displacement

Answer 6

is the direction and magnitude a particle has travelled from the equilibrium point

Question 7

displacement vs amplitude

Answer 7

amplitude is the maximum distance, displacement doesn’t have to be

Question 8

wavespeed equation

Answer 8

wavespeed = frequency * wavelength

Question 9

frequency equation

Answer 9

frequncey = 1 / time period

Question 10

true or false displacement-distance graphs are identical for transverse & longitudinal waves

Answer 10

true

Question 11

what else happens wjen a wave refracts

Answer 11

partial reflection

Question 12

what is the reflection of a sound wave

Answer 12

echo

Question 13

polarised waves definition

Answer 13

waves that are restricted to oscillate in 1 plane (1), perpendicular to the direction of energy transfer

Question 14

polarisation definition

Answer 14

the phenomenon in whoich oscillations of a transverse wave are limited to 1 plane

Question 15

phase difference defintiion

Answer 15

difference between displacements of particles (1) on a wave/ different waves

Question 16

In-phase

Answer 16

when particles oscillate in step reach their maximum positive displacement at the same time

Question 17

anti-phase

Answer 17

when particles oscillate out of step; one reaches it’s maximum +ve displacement & the other particle reaches maximum -ve displacement

Question 18

phase difference equation

Answer 18

distance between particles/wavelength

Question 19

what is phase difference measured in?

Answer 19

radians/ degrees

Question 20

how many radians & degrees is 1 cycle

Answer 20

1 cycle = 360 degrees = 2 radians

Question 21

what are 2 point described as if they have a phase difference of 180 degrees (1 radian)

Answer 21

anti-phase

Question 22

what are wavefronts

Answer 22

the peak of a water wave (i.e ripples)

Question 23

how can wavelength change, but frequency stay the same after refraction

Answer 23

e.g wavelength decreases, but wavespeed decreases ‘at same rate’

Question 24

definition of diffraction

Answer 24

the phenomenon in which waves spread out when passing through a gap or travel around a obstacle

Question 25

true or false all EM waves included light can be diffracted

Answer 25

true

Question 26

what changes when a wave diffracts? speed, wavelength, or frequency?

Answer 26

none of them

Question 27

What impacts how much a wave diffracts

Answer 27

depends on the relative side of hre wavelength and the gap / obstacle

Question 28

when is a wave diffracred the most

Answer 28

when the size of the gap/pbstacle is the same as the wavelength

Question 29

name four properties that are the same for all ENM waves

Answer 29

- travel at same speed in vacuum: 300,000 km/s - can be reflected, diffracted & refracted - all are transverse waves

Question 30

describe a wave that is in-phase

Answer 30

when party=icles osciliate IN STEP, i.e reach thier maximum positive displacement at the same time

Question 31

equation to solve phase difference

Answer 31

phase difference = distance between 2 particles / wavelength * 360 degrees

Question 32

waht can you find from displacememnt - distacne graph?

Answer 32

wavelength

Question 33

waht can you find from displacememnt - time graph?

Answer 33

PERIOD of the wave; not it's frequcney

Question 34

what do displacement -time graphs and displacement -distance graphs both represent

Answer 34

amplitude of wave

Question 35

how can light be polarised

Answer 35

use a polarising filter | reflect the light

Question 36

what EM waves are polarised for real life uses

Answer 36

radio waves

Question 37

what material can EM waves not pass through

Answer 37

metal

Question 38

what are polarised waves called

Answer 38

plane-polarised wave

Question 39

what is the symbol for unpolarised waves? vertically polarised? horizontally polarized?

Answer 39

search it up

Question 40

what is the law of reflection

Answer 40

when waves are reflected, the angle of incidence = angle of reflection

Question 41

when waves are reflected, .... changes .... don't change

Answer 41

wavelength and frequency don't change

Question 42

when waves are refracted, .... changes .... don't change

Answer 42

wavelength changes,

Question 43

what is Snell's law

Answer 43

sin i is directly proportional to sin r

Question 44

how do you calculate refractive index?

Answer 44

n = speed of light in a vacuum/ speed of light in medium

Question 45

when does toal internal reflection occur?

Answer 45

when angle of incidence is greater than the critical angle

Question 46

when does refraction occur?

Answer 46

when the angle of incidence is smaller than the critical angle

Question 47

What happens to the pattern when the width of the slit is reduced?

Answer 47

The intensities of all of the peaks decrease and the width of the pattern increases.

Question 48

similarities between longitudinal and transverse wvaes

Answer 48

They both transfer energy from one place to another without any overall (net) movement of matter.

Question 49

difference between oscillation vs waves

Answer 49

An oscillation describes the periodic motion of a particle about its mean position or equilibrium position, whereas a wave refers to the motion of the energy outwards from the initial disturbance

Question 50

what does sound wave speed depend on (2)

Answer 50

type of medium & temperature

Question 51

should the angle be below, above or equal to the critical angle to be internally reflected when pass into different medium

Answer 51

above

Question 52

should the angle be below, above or equal to the critical angle to be refracted and partially internal refelcted when pass into different medium

Answer 52

below

Question 53

should the angle be below, above or equal to the critical angle to pass along boundary when pass into different medium

Answer 53

equal