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Physics > Waves > Flashcards

Waves Flashcards

(54 cards)

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1
Q

What are waves caused by

A

Oscillations

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2
Q

What do waves transfer from one place to another

A

Energy

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3
Q

What are the two types of waves called

A

Transverse and longitudinal

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4
Q

What is one feature of of a longitudinal wave

A

The direction of vibration is parallel to the direction in which the wave travels

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5
Q

Does a longitudinal wave have compressions

A

Yes and rarefractions

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6
Q

Name two types of longitudinal waves

A

Sound
P-Waves

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7
Q

Name one feature of a transverse wave

A

The direction of vibration of the particles is perpendicular to the direction in which the wave travels

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8
Q

Name two transverse waves

A

EM waves
S-Waves

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9
Q

Whats the displacement of a vibrating particle

A

Its distance and direction from its equilibrium position

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10
Q

What is the amplitude of a wave

A

Maximum displacement of a vibrating particle

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11
Q

What is the wavelength of a wave

A

Least distance between two adjacent particles with the same displacement and velocity at the same time

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12
Q

What is a cycle in terms of waves

A

Maximum displacement to the next maximum displacement

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13
Q

What is the period of a wave

A

The time for one complete wave to pass a fixed point

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14
Q

What is the frequency of a wave

A

Number of cycles per second

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15
Q

What does an unpolarised transverse wave have

A

Oscillations in many planes

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16
Q

What does a polarised transverse wave have

A

Oscillations in one plane

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17
Q

What is one use of polarised lenses

A

Sunglasses

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18
Q

What happens when light is reflected

A

It becomes horizontally polarised causing glare

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19
Q

What can happen when we use a Polaroid

A

Block out glare

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20
Q

Why cant longitudinal waves be polarised

A

The vibrations occur in the same direction as the wave travels

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21
Q

How do you convert radians to degrees

A

Angle/180 x pi

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22
Q

360 degrees in radians

23
Q

270 degrees in radians

24
Q

270 degrees in radians

25
180 degrees in radians
Pi
26
90 degrees in radians
0.5 pi
27
0 degrees in radians
1 pi
28
What does phase difference tells us
How the different points on a wave are moving relative to each other
29
How can we show waves
As wavefronts
30
What is the law of reflection
Angle of incidence = angle of reflection
31
What changes when waves travel from medium to another
Speed and direction
32
What remains constant when waves travel from one medium to another
Frequency
33
When entering another medium what 3 things can happen
Reflection Transmission Absorption
34
What happens to the speed when a wave travels into a more dense medium
It slows down
35
What happens to the wavelength when a wave travels into a more dense medium
It decreases
36
What is diffraction
The so-reading out of waves as they pass the rough a gap or near an object
37
What is the resolution of a telescope
The measure of the smallest point of a telescope can successfully image
38
What can happen in low resolution images
Parts of the image may blur together. Two separate images may appear as one
39
Do longer waves diffract more
Yes
40
What happens when waves meet at point
They temporarily combine
41
What’s the name when a waves amplitude increases when they combine
Rise to interference
42
What is an example of two waves meeting in phase
Crest meets crest
43
What type of interference is produced when they meet in phase
Constructive producing larger amplitude waves
44
What type of interference occurs when two waves meeting out of phase
Destructive giving low or no amplitudes waves
45
What’s the difference between exactly out of phase and out of phase
Pi(dotted lines showing the waves next move)
46
What is an interference pattern
Combination of constructive and destructive interferences. Forms a repeated pattern of maxima and minima
47
Why does coherence matter
Required for a stable interference pattern (light waves from coherent sauces have the same frequency and phase difference which remains constant overtime)
48
Do coherent waves have the same wavelength
Yes
49
How are stationary waves formed
Two waves travelling in opposite directions with the same frequency,speed and amplitude which results in points of zero displacement and maximum displacement
50
What’s another word for zero displacement
Nodes
51
What’s another word for maximum displacement
Antinodes
52
What does in-phase oscillations mean
Every part of the wave vibrates in phase with every other part between nodes
53
What is the simplest type of stationary wave known as
The first harmonic
54
Do nodes every vibrate
No

Physics (4 decks)

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