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3rd quarter-grade 8 > science > Flashcards

science Flashcards

1
Q

form of radiant energy,electromagnetic radiation visible to the eye

A

light

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2
Q

bouncing of light when it hits a surface

A

reflection

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3
Q

perpendicular line to the surface at the point of incidence

A

normal line

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4
Q

angle between the incident ray and the normal

A

angle of incidence

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5
Q

angle between the reflected ray and the normal

A

angle of reflection

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6
Q

what lines are on the same plane

A

the incident ray,reflected ray and the normal to the reflected surface

same is true for refraction

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7
Q

angle of incidence is equal to?

A

angle of reflection

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8
Q

type of surface reflectance,mirror like reflection of light,reflected on smooth surfaces

A

Specular Reflection or Regular Reflection

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9
Q

parallel light
rays is incident on a rough surface and it scatters in different places

A

Diffuse Irregular Reflection

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10
Q

what are 3 artificial sources of light

A

bulbs, lambs,LEDS

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11
Q

is the bending of light as it passes through a transparent object

A

refraction

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12
Q

property of a given medium to slow down or delay the transmission of light

A

optical density

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13
Q

speed of light in a vacuum(c)

A

3x10^8 m/s

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14
Q

speed of light in water(c)

A

2.24x10^8 m/s

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15
Q

speed of light in glass(c)

A

1.88x10^8 m/s

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16
Q

index of refraction(n) equal

A

speed of light(c)/speed of light(v)
n=c/v

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17
Q

equation if the medium is underwater

A

n=actual depth/apparent depth

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18
Q

a ray entering an optically denser medium bend in which direction?

A

toward the normal

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19
Q

a ray entering aless dense medium bends where?

A

away from the normal

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20
Q

a ray oriented along the normal does what

A

does not bend

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21
Q

what is constant and independent of the angle of incidence

A

index of refraction of a particular medium

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22
Q

dutch astronomer and mathematician

A

willebrord snell

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23
Q

determined the relashonship of the angle of incidence and angle of refraction

A

willebrord snell

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24
Q

fill in the blanks

Snell’s law is defined as:
The ratio of the_______
_______ to the________ is a constant,
for the light of a given color and
for the given pair of media”.

A

sine of the angle of incidence and sine of the angle of refraction

25
Q

when did snell discover his law

A

1621

26
Q

a relationship relating the index of refraction in a given medium and the incident light angle to the index of refraction in the new medium

A

snell’s law

27
Q

formula for snell’s law

A

n1sin theta1=n2 sintheta2

where n is the index of refraction in 2 different mediums
and theta is t

28
Q

true or false

is light a wave?

A

true

29
Q

is light an electromagnetic wave?

A

true

30
Q

true or false

do all objects produce light

A

true

31
Q

splitting up of white light into 7 colors as i passes through a prism

A

dispersion

32
Q

why do colors split up when travelling through a prism

A

since they travel at different speeds

33
Q

when a beam of white light shoots through a prism it is called?

A

spectrum

range of colors of light

34
Q

name 3 of the colors of the spectrum

A

run* red-longest wavelenght,lowest frequency
off* orange
you* yellow
girlsgreen
boysblue
in* indigo
view* violet-shortest wavelength,highest frequency

acronym for easy memorization

35
Q

what was newton’s experiment

A

to show that white light consists of colours

36
Q

range of radiation

A

electromagnetic spectrum

37
Q

what is the electro magnetic spectrum

A

raja’s* radio wave-lowest frequency,longest wavelenght
mother* microwave
is* infrared wave
visisting* visible light
uncle* ultraviolet rays
xavier’s* x-rays
garden* gamma rays-highest frequency ,shortest wave lenght

acronym for easy memorizing

38
Q

natural spectrum appearing in the sky after a rainshower,caused by the dispersion of sun light by tiny water droplets

always appears opposite of the sun

A

rainbow

39
Q

do not need matter to transfer energy
made by vibrating electric charges and can travel through space by vibrating electric or magnetic fields

A

electromagnetic waves

40
Q

true or false

do all things emit Fm waves

A

false,they emit EM waves

41
Q

wavelengths become what as temperature increases

A

shorter

42
Q

wavelengths carry what?

A

radiant energy

43
Q

higher frequency=_____=_____

A

higher energy=higher temperature

44
Q

what light has the longest wavelength but lowest frequency

A

red light

45
Q

process where light coming from the sun travels through the earth’s atmosphere,the dust particles scatter the light in different directions

A

scattering of light

46
Q

why is the sky blue

A

the sky is blue beacuse it is scattered by the particles and molicules in the air

47
Q

bending of waves around a barrier or an obstruction

A

diffraction

48
Q

glass or plastic made up of many tiny parallel slits

A

diffraction gratings

ex.CD surfaces

49
Q

when two waves meet they have an effect on each other

A

interference

50
Q

when the crest of a wave meets the crest of another wave

A

constructive interference

51
Q

when the crest of a wave meets the trough of another wave

A

destructive interference

52
Q

where we have this interference we have brighter bands of light

A

constructive interference

53
Q

with this type of interference we get bands of darkness

A

destructive interference

54
Q

process of exchanging information by transmiting light pulses over n fiber

A

optical fiber communication

55
Q

hair thin cylindrical fiber of glass or any transparent dielectric medium,guide visible and infrared light over long distances

A

optical fiber

56
Q

made from transparent dielectrics

A

fiber

57
Q

used by many telecommunication companies to tranmit internet connection etc

A

optical fiber

58
Q

light forms a what

A

electromgnetic wave modeled to carry information

3rd quarter-grade 8 (22 decks)

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