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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

Types of waves

A

Electromagnetic and mechanical

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2
Q

Electromagnetic waves are

A

Oscillating electric and magnetic fields that progress through space without the need for a substance.

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3
Q

Longitudinal waves

A

Waves in which the direction of vibration is parallel to the direction of travel

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4
Q

Example of longitudinal wave

A

Waggling a slinky back and forward, sound waves and primary seismic waves.

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5
Q

Transverse waves

A

Waves which the direction of vibration is perpendicular to the direction in which the wave travels.

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6
Q

Examples of transverse waves

A

Electromagnetic waves, secondary seismic waves and waves on a string/wire.

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7
Q

What type of wave is plane polarised

A

Transverse

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8
Q

How to make polarised light unpolarised

A

Use a Polaroid or polarising filter

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9
Q

Equation for phase difference

A

2 πd / λ

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10
Q

180 degrees in radians

A

π

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11
Q

360 degrees in radians

A

2π

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12
Q

90 degrees in radians

A

π/2

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13
Q

Reflection

A

Light bouncing off surface and reflecting at the same angle

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14
Q

Refraction

A

When a wave passes a boundary where it slows down and changes direction

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15
Q

Diffraction

A

A wave spreading out after passing through a gap

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16
Q

Transmission

A

When a wave (like light) passes through a medium

17
Q

Absorption

A

When a substance captures energy from a wave

18
Q

Scattering

A

When light changes direction due to imperfections in the medium

19
Q

Superposition

A

The combination of waves as they pass through each other

20
Q

When a crest meets a crest

A

Super crest

21
Q

When a trough meets a trough

A

Super trough

22
Q

Destructive interference

A

When a peak meets a trough (phase difference of pi)

23
Q

Constructive interference

A

When a peak meets a peek (No or 2pi phase difference)

24
Q

Stationary wave

A

A wave where it forms areas of maximum displacement and no displacement

25
Q

Progressive waves

A

Conventional wave with no defined areas of superposition

26
Q

First harmonic

A

The simplest stationary wave pattern on a string

27
Q

Node

A

No displacement

28
Q

Antinode

A

Area of maximum displacement.

29
Q

What is the equation for first harmonic on closed closed system

A

L=1/2 wavelength (add half for each harmonic after)

30
Q

What is the equation of the first harmonic of a open open system

A

L=1/2 wavelength (add half for each harmonic after)

31
Q

What is the equation for the first harmonic of a open closed pipe

A

L=1/4 wavelength

32
Q

What is the job of an oscilloscope

A

To interpret waveforms

Physics (6 decks)

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