Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics As OCR > 4.4 > Flashcards

4.4 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

amplitude

A

maximum displacement of a wave from its rest position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

ferquency

A

number of complete wave cycles that occur in one second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

period

A

time taken for a wave peak to travel the distance of one wavelength(time taken for one oscillation)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

progressive wave

A

a type of wave that travels through a substance or space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

transverse wave

A

type of wave in which oscillations occurs at rights angles to the direction of wave propagation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

longitudinal wave

A

a type of wave in which oscillations occur parallel to the direction of wave propagation (cant travel through a vacuum).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is path difference measured in

A

n λ (1 λ= 1 wavelength)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is phase difference measured in

A

π radians (2πvradians = 1λ)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

principal of superposition

A

when 2 or more waves meet the total displacement at any one point is equal to the sum of the displacements that each individual wave would cause

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

interference

A

when two waves interact with each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

coherence

A

when waves have constant phase difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

constructive interference occurs when

A

the path difference between coherent sources is nλ where n is an integer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

cancellation occurs when

A

the path difference between two coherent sources is nλ/2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

stationary/ standing wave

A

the superposition of two progressive waves with the same wavelength moving in opposite directions energy is stored

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

node

A

point on a stationary wave where no displacement occurs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

anti node

A

point of a stationary wave where maximum displacement occurs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

em spectrum

A

radio, microwaves, visible light, uv, x-rays, gamma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

physical waves

A

progressive waves that transfer matter/particles ie sound waves or water waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

electromagnetic waves

A

progressive waves that transfer energy without transferring matter

20
Q

properties of em waves

A

can travel through a vacuum, posses both a magnetic and electrical waves at right angles to each other, all travel at 2.98x10^8 m/s in a vacuum, all transverse, all can be reflected refracted and diffracted, all demonstrate interference, all can be polarized

21
Q

polarized wave

A

a plane polarized wave oscillates in only one plane happens only in transverse waves

22
Q

what are polarizing filters made of

A

crystalline materials that absorb waves

23
Q

applications of polarized light

A

tv signals and radio signals are polarized so transmitting and receiving aerials must be aligned, 3d glasses, stress analysis of plastic

24
Q

malus’s law

A

the light passing through a perfect polarizer can be found by the equation= I=Imaxcos^2θ

25
Q

refraction

A

the change in direction a light ray undergoes when it enters a medium with a different optical density

26
Q

why does refraction occur

A

light travels at different speeds in materials with different optical densities. the change in direction occurs due to the change in speed

27
Q

in what direction does light bend

A

towards the normal as it slows, away from the normal as it speeds up

28
Q

how to find the refractive index of a material

A

n=c/v

29
Q

snells law

A

n1sin1 θ1=n2sin2 θ2

30
Q

critical angle

A

when the angle of incidence = the critical angle light will travel along the boundary of the secondary medium it will be refracted by 90 degrees

31
Q

total internal reflection

A

when the angle of incidence exceeds the critical angle light is reflected in the material

32
Q

young’s double slit equation

A

λ=(ax)/d d=distance from slits to screen, x=distance between adjacent maxima, a=slit sepparation

33
Q

diffraction

A

the spreading out/bending of light waves as they pass through a gap or around an obstacle

34
Q

when is diffraction greatest

A

when the width of the aperture=wavelegnth

35
Q

diffraction grating

A

a place with many closely spaced parallel slits that produces spaces interference pasterns as a result of superposition

36
Q

why use diffraction gratings not a double slit arangement

A

the pattern is much clearer making it possible to calculate the wavelength

37
Q

diffraction grating equation

A

nλ=dsinθ d=slit sepparation

38
Q

how to find the maximum number of orders

A

substitute θ=90

39
Q

Fundamental mode of vibration

A

In this mode the length of the string is 1/2 the wavelength. This produces the lowers possible frequency the 1st harmonic

40
Q

2 ways to graph waves

A
  • “snapshot of wave” shows displacement (y axis) vs distance travels (x axis)
  • displacement against time
41
Q

How to represent longitudinal waves graphically

A

Pressure against position

42
Q

How to find the period of a wave with an oscilloscope

A

Distance between peaks x time base setting

43
Q

Uv-a

A

99% of uv
Causes tanning
3.15-4 x10-7 meters (wavelength)

44
Q

Uv-b

A

Causes skin cancer and sunburn

2.8-3.15x10-7 m wavelength

45
Q

Uv-c

A

Filtered out by atmosphere

1-2.8x10-7 m wavelength

Physics As OCR (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions