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Jarvis > science > Flashcards

science Flashcards

1
Q

what is a wave?

A

the transfer of energy without matter

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2
Q

what are the 2 types of waves

A

longitudinal and transverse

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3
Q

what is a longitudinal wave

A

a wave that’s energy goes back and forth.

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4
Q

what is a transverse wave

A

a wave that’s energy goes up and down

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5
Q

what type of wave is a light wave.

A

tranverse

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6
Q

what is the wave length

A

1 peak + 1 trough, 2 peaks or 2 troughs

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7
Q

what is the wavelength unit of measurement

A

lambda

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8
Q

what is the peak of a wave

A

the highest part of a wave

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9
Q

what is the trough of a wave

A

the lowest part of the wave

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10
Q

what is the amplitude of a transverse wave

A

the height of the crests above the middle position

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11
Q

what is frequency

A

frequency is the number of something in a unit of time

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12
Q

what is hertz/hz

A

the number of waves per second

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13
Q

when a longitudinal waves are very close together they are called:

A

compressions

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14
Q

when a longitudinal waves are very far from each other they are called:

A

rarefactions

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15
Q

wavelength in light determines

A

colour

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16
Q

amplitude in light determines

A

brightness

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17
Q

wavelengths are measured in

A

metres

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18
Q

v in the wave equation is

A

velocity/speed in metres per second

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19
Q

f in the wave equation is

A

the frequency in hz

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20
Q

lambda in the wave equation is

A

the wavelength in metres

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21
Q

the wave equation shows the

A

speed of a wave

22
Q

the wave equation is

A

v=flambda

23
Q

time period is

A

T=1/f

24
Q

the time period is measured in

A

seconds

25
Q

hz =

A

1/second

26
Q

heat transfer occurs in three ways

A

conduction convection radiation

27
Q

what is conduction

A

this happens through the vibration of the heat particles that vibrate ,more in turn.

28
Q

what is convection

A

due to the heat higher vibration, it moves cold air out of the way and quickly fills the room

29
Q

what is radiation

A

using heat waves to transfer heat WITHOUT OTHER PARTICLES

30
Q

state the temperature on the Fahrenheit celsius and Kelvin scales at which water freezes

A

0c 32fahrenheit 273kelvin

31
Q

the speed of sound through air at 0 degrees c in metres per second

A

331

32
Q

the speed of sound through air at 18 degrees c in metres per second

A

342

33
Q

the speed of sound through water in metres per second

A

1440

34
Q

the speed of sound through wood in metres per second

A

4500

35
Q

the speed of sound through steel in metres per second

A

5100

36
Q

the speed of sound through glass in metres per second

A

5200

37
Q

how many Australians have a hearing disability

A

1 mil

38
Q

light is a form of what energy

A

electromagnetic radiation

39
Q

when light hits a surface it may:

A

be transmitted, reflected or absorbed.

40
Q

what is a translucent material

A

some light reflected, and some light passed through.

41
Q

what is a transparent material

A

almost all light is transmitted through the substance. a clear image can be seen through it.

42
Q

what is a opaque material

A

light is either reflected from or absorbed into the substance, and no light is transmitted. no image can be seen through it.

43
Q

what is diffuse reflection

A

the surface of the objects are quite rough when viewed up close. these surfaces reflect light in many directions, and do not form an image.

44
Q

what is the law of reflection

A

angle of incidence(i) = angle of reflection(r)

45
Q

what is refraction

A

the light bending due to warped glass

46
Q

what is a convex lens

A

a lense that bulges outwards

47
Q

what is a concave lens

A

a lense that bulges inwards

48
Q

what is a real light ray

A

a image that forms when light rays cross

49
Q

what is a virtual light ray

A

a image that forms when light rays appear to cross but don’t.

50
Q

what is the law of refraction

A

n_1 \sin \theta_1 = n_2 \sin \theta_2

51
Q

what is the depth illusion

A

when part of the refraction of your eyes is reflected and it seems as if something is closer than it actually is

Jarvis (12 decks)

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