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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

Definition of wave

A

A wave is something which transfers energy (and information) without transferring matter

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2
Q

What is a transverse wave?

A

A transverse wave is one where the vibration is perpendicular to the direction of energy transfer

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3
Q

What is the wavelength

A

The distance between two consecutive crests

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4
Q

What is the amplitude

A

The height between the equilibrium position and the crest

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5
Q

What happens in a transverse wave when the wave is transmitted through the medium

A

Particles move up and down

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6
Q

Examples of transverse waves

A

Water
Light
Electromagnetic

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7
Q

What is a longitudinal wave

A

A longitudinal wave is one where the direction of vibration is along the same line as the direction of energy transfer

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8
Q

What is a compression

A

A region of high pressure due to particles being close together

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9
Q

What is a rarefaction

A

A region of low pressure due to particles being spread further apart

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10
Q

What is frequency

A

The number of complete cycles/oscillations/vibrations per second

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11
Q

What is frequency measured in

A

Hertz

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12
Q

What is time period

A

The time taken for one complete cycle - in seconds

T=1/T
F=1/T

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13
Q

What is the wave equation?!!!!!

A

Speed = frequency x wavelength

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14
Q

GPE equation

A

GPE = mass x gravitational field strength x height

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15
Q

KE equation

A

1/2 x mass x (speed)^2

M = 2KE/V^2

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16
Q

What happens when an object falls

A

It loses GPE and gains an equal amount of KE

17
Q

Work and power

A

Energy changed = work done

18
Q

Power is the ….

A

Rate of energy transfer (work transfer)

19
Q

Power equation

A

Power = work done/time taken

20
Q

What is the Doppler effect

A

The apparent change in frequency of a wave when there is a relative motion between the source and the observer

21
Q

When is the Doppler effect noticeable

A 
In sound (change of pitch)
In light (change in colour)

It’s only noticeable when the speed of movement gets around the speed of the wave

Physics (15 decks)

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