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Physics A-level > Waves 4.4.1 To 4.4.2 > Flashcards

Waves 4.4.1 To 4.4.2 Flashcards

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1
Q

What is phase difference

A

How in sync two points on a wave are

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2
Q

What is period

A

the time it takes for one complete pattern of oscillation

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3
Q

what is the frequency

A

the number of oscillations per unit time

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3
Q

what is a wave length

A

the distance between two successive identical points on a wave

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4
Q

what is the displacement

on a wave

A

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

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5
Q

what is the amplitude

A

the maximum displacement

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6
Q

what is antiphase

A

half a wave cycle

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7
Q

how to calculate the radian

A

degrees/180 x π

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8
Q

how to get radian to angle in degrees

A

radian/π x180

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9
Q

what is the equation for frequency

A

F= 1/Time period (T)

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10
Q

how to work out the time period on oscilloscope

A

time period= distance between peaks x time base

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11
Q

equation for intensity

A

intensity = power / area (surface area)

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12
Q

how to work out surface area for circle

A

4πr^2

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13
Q

Believe and you will

A

ᕙ(`▿´)ᕗ

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14
Q

what is the units for period

A

s (seconds)

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15
Q

what is the unit for wavelength

A

m (meters)

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16
Q

what is the unit for frequency

A

Hz (Hertz)

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17
Q

what is the unit for phase difference

A

radian/rad

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18
Q

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

A

2π

(one) λ

19
Q

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

A

π

1/2 λ wavelength

20
Q

what is 90 degrees in rad and what is the wavelength

A

1/2π for radian

1/4 λ wavelength

21
Q

what is 45 degrees in rad and what is the wavelength

A

1/4π

1/8 λ

22
Q

what is a mechanical wave

A

a wave that moves around a fixed point

23
Q

what is a progressive wave

A

an oscillation that transfers energy and information

24
Q

the higher the amplitude…

A

the greater the intensity

25
Q

intensity is proportional to…

A

amplitude^2

26
Q

What is diffraction

A

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

27
Q

When does minimum diffraction occur

A

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

28
Q

What is the principal of super position

A

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

29
Q

What is phase

A

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

30
Q

What is the equation for intensity

A

Intensity= power /area

31
Q

What fields make up electromagnetic waves

A

Vibrating electric fields and magnetic fields

32
Q

Name the em spectrum

A

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

33
Q

What is plane polarisation

A

The plane in which a wave vibration

34
Q

What is the principle of superposition

A

Resultant displacement is equal to the sum of the individual displacements

35
Q

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

A

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

36
Q

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

A

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

37
Q

What is refraction

A

The way a wave changes direction when entering a different medium

38
Q

constructive interference occurs when

A

(nλ) n is integer

39
Q

destructive interference occurs when

A

(n+1/2)λ

40
Q

tell me malus’ law

A

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

41
Q

wavelength of light equation young double slit

A

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

42
Q

grating equation for wavelength

A

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

43
Q
A
44
Q

What is meant by a plane polarised wave (2)

A

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

Physics A-level (10 decks)

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