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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
when did snell discover his law
1621
26
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
snell's law
27
formula for snell's law
n1sin theta1=n2 sintheta2 | where n is the index of refraction in 2 different mediums and theta is t
28
# true or false is light a wave?
true
29
is light an electromagnetic wave?
true
30
# true or false do all objects produce light
true
31
splitting up of white light into 7 colors as i passes through a prism
dispersion
32
# [](http://) why do colors split up when travelling through a prism
since they travel at different speeds
33
when a beam of white light shoots through a prism it is called?
spectrum | range of colors of light
34
name 3 of the colors of the spectrum
run* red-longest wavelenght,lowest frequency off* orange you* yellow girls*green boys*blue in* indigo view* violet-shortest wavelength,highest frequency | acronym for easy memorization
35
what was newton's experiment
to show that white light consists of colours
36
range of radiation
electromagnetic spectrum
37
what is the electro magnetic spectrum
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
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
rainbow
39
do not need matter to transfer energy made by vibrating electric charges and can travel through space by vibrating electric or magnetic fields
electromagnetic waves
40
# true or false do all things emit Fm waves
false,they emit EM waves
41
wavelengths become what as temperature increases
shorter
42
wavelengths carry what?
radiant energy
43
higher frequency=_____=_____
higher energy=higher temperature
44
what light has the longest wavelength but lowest frequency
red light
45
process where light coming from the sun travels through the earth's atmosphere,the dust particles scatter the light in different directions
scattering of light
46
why is the sky blue
the sky is blue beacuse it is scattered by the particles and molicules in the air
47
bending of waves around a barrier or an obstruction
diffraction
48
glass or plastic made up of many tiny parallel slits
diffraction gratings | ex.CD surfaces
49
when two waves meet they have an effect on each other
interference
50
when the crest of a wave meets the crest of another wave
constructive interference
51
when the crest of a wave meets the trough of another wave
destructive interference
52
where we have this interference we have brighter bands of light
constructive interference
53
with this type of interference we get bands of darkness
destructive interference
54
process of exchanging information by transmiting light pulses over n fiber
optical fiber communication
55
hair thin cylindrical fiber of glass or any transparent dielectric medium,guide visible and infrared light over long distances
optical fiber
56
made from transparent dielectrics
fiber
57
used by many telecommunication companies to tranmit internet connection etc
optical fiber
58
light forms a what
electromgnetic wave modeled to carry information

3rd quarter-grade 8 (22 decks)

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