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Science > Physic And Climate > Flashcards

Physic And Climate Flashcards

1
Q

Energy in a wave

A
  • in a water wave, energy passes through water from one point to another as the wave rises and falls
  • the movement of energy allows the wave to do the work
  • only the energy moves forward
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2
Q

Crest

A

highest point of wave

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3
Q

Trough

A

lowest point of wave

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4
Q

Rest position

A

level of water when there are no waves

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5
Q

Amplitude

A
  • height of wave from rest position to crest or depth from the rest position to the trough
  • the larger the amplitude the more energy that is
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6
Q

Wave length

A
  • the distance form one place in a wave to the next similar place on the wave: for example CREST TO CREST OR THE DISTANCE FROM TROUGH TO TROUGH
  • symbol for the wavelength is (lambda) and measured in metres
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7
Q

Frequency

A

the rate of repetition of a wave

  • the higher the frequency the more energy the wave passes along
  • the standard symbol for frequency is f
  • is measured in cycles per second or hertz (hz)
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8
Q

Relationship between frequency and wavelength

A
  • wavelength and frequency have an invers relationship.

v= fw, where v is the speed

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9
Q

longest wavelength and smallest wavelength to the shortest wavelength and highest frequency

A 
radio waves 
mircowaves 
infrared light 
visible light 
ultraviolet 
x- rays 
gamma rays
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10
Q

Radio waves

A
  • radio and television

- cell phones, radar and magnetic something

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11
Q

Microwaves

A
  • radar
  • satellite signals
  • ovens
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12
Q

infrared lights

A
  • heat (keep foods warm)
  • remote controls
  • motion sensors
  • night vision goggles
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13
Q

Visible light

A
  • this is the portion of the electromagnetic
  • in order from long to short wavelength:
    red, orange, yellow, green, blue, indigo, violent
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14
Q

ultraviolet

A
  • small amount is needed by humans to produce vitamin D
  • but too much causes sunburn and increases skin cancer risk
  • used to disinfect drinking water
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15
Q

X- Rays

A
  • very high energy of radiation
  • medical imaginig of bones and teeth
  • scanning language at airport
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16
Q

Grammar Rays

A
  • extremely high energy radiation and shorteset wavelength
    I used to sterilize medical equipment
  • cancer treatment
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17
Q

Models

A
  • a representation of an object, event, or a procees based on our observations of its characteristics and properties
  • used to understand comples concepts
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18
Q

Lights

A
  • modelled and compared to water waves

- both transfer energy and they both travel outward in all directions from their source

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19
Q

wave model of light

A
  • similarities between light and the movement of waves on the surface of water helps us to explain several properties od light that we see
20
Q

Prisms

A

a transparent glass or plastic object with flat, polished sides

  • it can separate white light into colours of the rainbow
  • the difference between colours of light is that each colour has a different wavelength and frequency
21
Q

Rainbow

A

ROY G BIV

22
Q

additive colour theory of light

A
  • white light is composed of different colours (wavelength) of light
  • white light can be produced by using 3 colours; red, green, and blue (primary colors)
  • mix 2 colour equally = secondary
23
Q

red+green

A

yellow

24
Q

red+blue

A

magenta

25
Q

green+blue

A

cyan

26
Q

subtractive colour theory of light

A
  • light waves strikes an object
  • some wavelengths of light reflect (bounce off)
  • colour you see depends on the wavelengths that are reflected
  • other wavelengths are light are absorbed by the object
  • opposites to colours of the additive theory
27
Q

black objects

A

absorbs all

28
Q

white objects

A

reflected all colours

29
Q

blue objects

A

reflects blue and absorbs all other colours

30
Q

subtractive colours

A
  • cyan, magenta and yellow
31
Q

natural sources of lights on earth

A

-sun
- star
- lighting
- fire
also plants and animaks= bioluminescence (to produce light)
examples fireflies

32
Q

source of light

A
  • natural light

- artificial light

33
Q

natural light

A

light produced by sun or by star

34
Q

artificial light

A

light produced by human technology

35
Q

incandescent light

A
  • very high temp: inefficient

- being eliminated from widespread use

36
Q

florescent light

A
  • by some substance when they are exposed to electromagnetic radiation
37
Q

phosphorescent light

A
  • to store energy BS EMITS IT SLOWLY OVER A LONG PERIOD OF TIME
38
Q

chemiluminescene

A
  • light produced from a chemical reaction without a rise in temp
39
Q

tribuluminescene

A
  • light produced by friction
40
Q

electric discharge

A
  • light produced from an electric current passing through the air
41
Q

electroluminescene

A
  • transforming electrical energy directly in light energy
42
Q

light and water waves both

transfer energy

A

travel outward in all directions from their source

43
Q

light and matter

A

light is represented as a straight lines (called rays) which show the direction that light travels: until it strikes something

44
Q

transparent

A

transmit light frelly

45
Q

translucent

A

transmit some light but not enough to see through the material clearly

46
Q

opaque

A

absorb and reflect light but to not transmit it

47
Q

Wave

A

disturbance that transfer energy from one point to another without transferring matter
- row boat without paddles

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