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Year 8 > Physics > Flashcards

Physics Flashcards

1
Q

What is a wave

A

A movement of energy

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2
Q

How is energy transferred

A

WAVES
Heating
Forces
Electrical current

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3
Q

What is sound caused by

A

Vibrations

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4
Q

What do vibrations travel through

A

Medium

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5
Q

What is a medium

A

Contains particles

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6
Q

How is sound caused

A

The vibration of an object and particles, which creates sound waves, energy is transferred during this process and can only work by vibrations in a medium

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7
Q

What sort of wave is sound

A

Longitudinal wave

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8
Q

Which direction does a longitudinal wave energy travel

A

Energy transfer is parallel to the direction the wave travels

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9
Q

What is a wave made of

A

Compression

Rarefaction

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10
Q

What is a light wave

A

Transverse wave

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11
Q

What direction does energy transfer happen in a light

A

Energy transfer is perpendicular to the direction the wave travels

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12
Q

What is an echo

A

A hard reflected sound wave

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13
Q

Which surface will create an echo

A

A smooth, hard and flat surface

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14
Q

Which surface absorbs sound

A

Rough surface

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15
Q

What happens when a wave is absorbed

A

It absorbs energy transferred into it and the tempature of the substance increases

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16
Q

Speed of sound

A

Distance=speed/time

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17
Q

Sound will travel the fasyesy through…

A

A solid because the particles physically touch and vibrations can be passed from particle to particle easier

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18
Q

Why can’t sound travel through a vacuum

A

There are no particles to vibrate and pass on the energy

19
Q

Who is echolocation used by

A

Dolphins, bats and submarines

20
Q

What is frequency

A

Frequency is the pitch of a sound

21
Q

Sound more waves mean a…

A

Higher pitch frequency

22
Q

What is frequency measured in

A

Hertz

23
Q

What is pitch affected by

A

The speed of vibrations

24
Q

What is volume determined by

A

The amplitude of a wave and the size and energy of the vibrations

25
Q

What is volumes determined in

A

Decibels (dB)

26
Q

What is amplitude

A

The distance of particles that are displaced by vibrations

27
Q

How does amplitude happen

A

The more vibration, the more energy created in the particles and then the particles are displaced by vibration creating a louder sound

28
Q

How quick to light waves travel

A

300000000

29
Q

What pattern are the waves for light waves

A

Straight lines

30
Q

What is light measured in

A

Lux

31
Q

Angle of reflection and angle of incidence…

A

Are the SAME

32
Q

Which objects reflect light the best

A

Smooth shiny surfaces
Pale colours
Clear images as they reflect light regularly

33
Q

Objects that do not reflect light well

A

Rough Matt surfaces
Dark colours
Give no or diffuse images

34
Q

What is refraction

A

When light bends

35
Q

Why does it happen

A

The light CHanges speed

36
Q

What happens when light enters a more dense medium

A

It bends away from the normal

37
Q

What does tagaga stand for

A

Towards air glass away glass air

38
Q

What is the electromagnetic spectrum

A

Radio microwave infrared visible light untravidet X-ray gamma ray

39
Q

What is a prism

A

It splits a ray of white light into a spectrum of colours, known as dispersion

40
Q

Wavelength in colour

A

Each colour has a slightly different wavelength, red has longest wavelength and refracted least

41
Q

How are colours made

A

By mixing other colours of light

42
Q

What are the 3 primary colours

A

Blue red and green

43
Q

How is black made

A

Absorbs all wavelengths of light

44
Q

How is white made

A

Object will absorb no colour and therefore all of the light

Year 8 (4 decks)

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