Waves 4.4.1 To 4.4.2

Question 1

What is phase difference

Answer 1

How in sync two points on a wave are

Question 2

What is period

Answer 2

the time it takes for one complete pattern of oscillation

Question 3

what is the frequency

Answer 3

the number of oscillations per unit time

Question 3

what is a wave length

Answer 3

the distance between two successive identical points on a wave

Question 4

what is the displacement

on a wave

Answer 4

the distance any part of the wave has moved from its mean

Question 5

what is the amplitude

Answer 5

the maximum displacement

Question 6

what is antiphase

Answer 6

half a wave cycle

Question 7

how to calculate the radian

Answer 7

degrees/180 x π

Question 8

how to get radian to angle in degrees

Answer 8

radian/π x180

Question 9

what is the equation for frequency

Answer 9

F= 1/Time period (T)

Question 10

how to work out the time period on oscilloscope

Answer 10

time period= distance between peaks x time base

Question 11

equation for intensity

Answer 11

intensity = power / area (surface area)

Question 12

how to work out surface area for circle

Answer 12

4πr^2

Question 13

Believe and you will

Answer 13

ᕙ(`▿´)ᕗ

Question 14

what is the units for period

Answer 14

s (seconds)

Question 15

what is the unit for wavelength

Answer 15

m (meters)

Question 16

what is the unit for frequency

Answer 16

Hz (Hertz)

Question 17

what is the unit for phase difference

Answer 17

radian/rad

Question 18

what is 360 degrees in radian/ rad and what is the wavelength

Answer 18

2π

(one) λ

Question 19

what is 180 degrees in radian/ rad and what is the wavelength

Answer 19

π

1/2 λ wavelength

Question 20

what is 90 degrees in rad and what is the wavelength

Answer 20

1/2π for radian

1/4 λ wavelength

Question 21

what is 45 degrees in rad and what is the wavelength

Answer 21

1/4π

1/8 λ

Question 22

what is a mechanical wave

Answer 22

a wave that moves around a fixed point

Question 23

what is a progressive wave

Answer 23

an oscillation that transfers energy and information

Question 24

the higher the amplitude...

Answer 24

the greater the intensity

Question 25

intensity is proportional to...

Answer 25

amplitude^2

Question 26

What is diffraction

Answer 26

The spreading of a wave after passing around an obstacle or through a gap

Question 27

When does minimum diffraction occur

Answer 27

When the gap size is far smaller/ larger than the wavelength

Question 28

What is the principal of super position

Answer 28

When two or more waves meet the total displacement is the sun of displacements that each wave would’ve caused

Question 29

What is phase

Answer 29

The measurement of position of a certain point along the wave cycle

Question 30

What is the equation for intensity

Answer 30

Intensity= power /area

Question 31

What fields make up electromagnetic waves

Answer 31

Vibrating electric fields and magnetic fields

Question 32

Name the em spectrum

Answer 32

Radio waves Microwaves Infrared radiation Ultra violet X-rays Gamma rays

Question 33

What is plane polarisation

Answer 33

The plane in which a wave vibration

Question 34

What is the principle of superposition

Answer 34

Resultant displacement is equal to the sum of the individual displacements

Question 35

When a wave bends towards the normal it’s….

Answer 35

Slowing down and going from a less optically dense medium to a more optically dense medium

Question 36

When a wave bends away from the normal it’s…

Answer 36

Speeding up and going from an optically denser medium to a less optically dense

Question 37

What is refraction

Answer 37

The way a wave changes direction when entering a different medium

Question 38

constructive interference occurs when

Answer 38

(nλ) n is integer

Question 39

destructive interference occurs when

Answer 39

(n+1/2)λ

Question 40

tell me malus' law

Answer 40

Malus' law states that when a perfect polariser is put in a beam of polarised light, the intensity of the light that passes through it is given by I= Io Cos^2θ

Question 41

wavelength of light equation young double slit

Answer 41

λ=ax/D a = slit separation x= distance between fringes D= distance between slits and screen

Question 42

grating equation for wavelength

Answer 42

nλ =dsinθ n=order number d= slit seperation θ= angle between 0th and nth fringe

Question 44

What is meant by a plane polarised wave (2)

Answer 44

-Oscillations are in one direction only - perpendicular to the direction or wave propagation